Of those choices, I'd choose "B"

"A" has a crunch factor (chips, tostada shells, etc) that are going to get soggy when sitting, unless you have the salad and crunch item separated. If you do that, A is a reasonable choice.

"C" involves what will be cold churros at some point, which are not good for anyone.

"B" holds up when sitting around (and likely reheats well).