I'm voting C, for the funny, and obviously we need some form of intelligence design to use our bonus. Some form of chameleon nonsense would be useful, However, we also need to do something else. For the navy side, a better battleship than theirs is my personal favorite option; for the non-naval side a standard-issue Mutant Rose-based infantry improvement would be really, really good. Harder bones, tougher skin, stronger muscles, better eyesight, innate poison resistance for when the gas gets going (so we don't need to bother with masks that can obstruct sight and such), the options are nearly endless. I'd say "personal healing factor" but that's basically what HAX does anyway.
Or we could do, y'know, an APC so that our soldiers don't have to walk literally everywhere. That might be helpful.
Varspit-class Battleship
In order to combat the battleships of the enemy, we've engineered our own battleship to counter them, while being better in every conceivable way.
The Varspit is a fast battleship akin to the enemy's, with GavReactor powerplant driving four propellers to give it a top speed of 28 knots, matching the enemy's most prevalent battleships. The use of the GavReactor vastly reduces the size of our engines compared to previous generations of ships. Unlike previous ships, however, soundproofing is omitted from all aspects of the ship (except in places where it's necessary for the function of the engine or sonar system or whatnot).
It carries an extremely powerful Wellsonar system to locate targets even in adverse weather conditions, and a substantial amount of work went into the long-base rangefinders located on the mast, aft superstructure, and on each turret. This ship is meant to have a range advantage over enemy ships in every conceivable condition. The torpedo defense system is also backed with Wellmoss to help seal up any breaches. As undoubtedly expensive vessels, the Varspits are meant to be flagships, and thus carry enhanced communications suites and quarters for an admiral and their staff plus an admiral's bridge to command the fleet from.
For weaponry, the ship is armed with four twin turrets carrying 380mm/15in guns (4x2 380mm, in short), giving it eight substantially longer ranged and more powerful guns capable of dealing meaningful damage to the enemy's battleships. For a secondary battery, it carries 16 twin 120mm dual-purpose mounts, the same gun and turret used in the Silada and Mukebaza (16x2 120mm). There are actually eight torpedo tubes, two on each side aimed about 45 degrees away from the forwards line of travel, two forwards (aimed forwards, surprisingly enough), and two aft, aimed, you guessed it, aft. These torpedo tubes are meant to give the battleship a last-ditch option against, say, quickly-closing enemy suicide destroyers. A battery of our preexisting 20mm autocannon slapped down where there is space rounds out the armament.
The battleship has a 330mm thick armored belt, 250mm thick barbettes, 330mm turret armor, and a 75mm thick armored deck. The torpedo protection system uses space saved by the GavReactor propulsion system to allow the TPS to move inside the hull instead of being comprised of external bulges, reducing drag but requiring significant use of internal space. The conning tower is not armored, and instead a more substantial bridge structure is utilized since most commanders don't use the constricted views and small spaces of armored conning towers anyway...and there are reports that when struck with a heavy shell that detonates without penetrating the armor, everyone inside a conning tower would die anyway due to the blast effects and/or spalling. So we've added enough armor to proof the bridge against splinters and left it at that.