Guillermo is adjusting well to his new class.

• A. He is getting used to it.
• B. He dislikes it.
• C. He is moving away.
• D. He is failing.

Answer: (A)

The main idea is understanding how to tell that someone is becoming comfortable in a new situation, using a natural phrase for adaptation. Guillermo is adjusting well to his new class means he is becoming accustomed to the class environment, routines, and peers. That exact sense is captured by saying he is getting used to it.

Disliking it would show the opposite sentiment, moving away isn’t about adapting to the class, and failing refers to performance rather than how well he’s adjusting.