Answer:
The scenario described, where Alex asks someone else for information he does not have, suggests that Alex has a theory of mind.
Step-by-step explanation:
A theory of mind is the ability to understand that other individuals have their thoughts, beliefs, and knowledge, which may differ from one's own. In this case, Alex recognizes that the student he stops in the hallway might have information about the classroom's location that he does not possess, demonstrating his understanding of others' perspectives. So, the correct option is (d) a theory of mind.