Answer: B. Lying on the king-size bed, Anakin can spread his legs and arms all the way out.
Step-by-step explanation:
A king-size bed is large enough to accommodate two people and give them a lot of space so if only one person is on it, it would give them more space than they need which is evidenced by the assertion that Anakin could spread his legs and arms all the way out.
By definition therefore, the king-size bed is spacious much like the classrooms described in the question.