You should probably have made that clear at the very beginning of the post; when I read it I first assumed you had simply neglected to tell us the instructions.

Gotcha. I'll edit.

In which case, A probably does make the most sense, since it seems to represent the most "equilibrium-like" situation, assuming what is being represented is a box with an object tied to it via a string, viewed from the side (not above or below).

Really? I don't see that at all. Surely B would be more reasonable, in that case? On A, it'd sort of be hanging off to the side.