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Either A or C
A's advantges - The 12-gauge. F has a 12-gauge too, but it's weirdly prototype-looking, semi-automatic (or even full auto?) and I don't trust it's reliability. The SPAS-12 on the other hand, I trust and can be fired either semi-auto or pump (if something goes wrong). Nothing better than 12-gauge (except maybe 10-gauge) for blowing heads clean off in CQB.
Also, having 2 side arms can't be a bad thing either, 9mm doesn't have the greatest stopping power, but these are zombies where only headshots count anyway.
A's disadvantages - The machete isn't very heavy, and thus, not the best weapon for cracking skulls open with. Not saying it's not possible, just not ideal. Needs a bit more weight behind it, also, not a very long handle, meaning you have to get closer to your victim. I'd much rather a sharpened spade, an axe, even a sledge hammer.
C's advantages. Whilst not the best choice for CQB, the M4's 5.56mm round doesn't produce much recoil, and is still capable of doing a very significant amount of damage to the skull. It's a nice middle ground between a CQB weapon like the 12-gauge and a longer-ranged battle rifle in 7.62x51 or some such calibre. With the ACOG scope, it can be useful out to ranges of 300-400 meters for headshots on zombies. For CQB, the ACOG can either be removed so that iron sights can be used, or the ACOG's back-up sights (on top) can be used instead.
Now for my favourite item (or items), double axes! Now, I'd be happy with just one, these are perfect, but having a back up is by no means a bad thing (though I'd only use one at a time). It's heavy at the hitting end, has a light, long handle, and can smash a skull open in one foul swoop. Perfection!
Disadvantages -
Some people might like the idea of the M203 grenade launcher underneath, but I'd probably just ditch it. Both grenades and grenade rounds aren't going to do shit to a zombie. Contrary to Hollywood portrayal, grenades very rarely blow off body parts and usually kill from a) force of the explosion (concussion trauma) and b) shrapnel wounds. Unless you're lucky enough to have a piece of 'nade shrapnel enter a z's brain, it ain't doing shit.
I really can't be arsed to write anymore, but I'd rather have a sidearm, with a bigger magazine than a Deagle, and molotovs risk more harm to yourself than zombies. Pro-tip: guess what, fire only makes zombies burn and since they're dead already, it doesn't do shit to them, except make them a bit charred.
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