This is pretty silly. Being fluent in C has not much at all to do with language quirks. Since (I assume) the 1980s, the comp.lang.c crowd has been reminding us that compilers are fundamentally unknowable and that sizeof(char) could very well be a random walk averaging 1.35. Meanwhile, in the real world, network and kernel programmers have been using some variant of u_int32_t since forever to ensure that they can parse network packets and driver data structures by copying or even casting things into structs.
Also, why would anyone write ' ' * 13? For most of these questions, if your first instinct is "that doesn't look like good C code", your answer is better than the "right" answer.
Also, why would anyone write ' ' * 13? For most of these questions, if your first instinct is "that doesn't look like good C code", your answer is better than the "right" answer.