Answer:
B. What did she mean by that? He searched her face for answers, but her gaze was, as always, impenetrable.
Explanation:
The third-person limited point of view is the perspective of the third person without know all the details of the situation. In this case, we are looking from the limited perspective of the guy searching for answers in the lady; however, we cannot know what she is thinking.
Compare this answer to all the others in which we can see the thoughts or plans of the entire situation, without necessarily having all the information in view.
Cheers.