Answer:
the best answer would be B, lying on the king-sized bed, Anakin can spread his legs and arms all the way out.
if something is spacious, it means that it's roomy and open, with plenty of space. since Anakin is able to comfortably spread his body out in the bed, it makes the bed spacious, just as the classrooms that are mentioned in the initial problem. the rest of the answer options have to do with spaces that are snug and crowded, the opposite of spacious.