Question

you are barking up the wrong tree if you think caleb will help you with that. lately, he really has a ______. tip of the iceberg cream of the crop chip on his shoulder

Explanation:

To solve this, we analyze the idioms:

• "tip of the iceberg" means a small visible part of a larger problem, which doesn't fit the context of Caleb's attitude.
• "cream of the crop" refers to the best of a group, also not related to attitude.
• "chip on his shoulder" means having a hostile or resentful attitude, which makes sense as the sentence implies Caleb won't help due to his mood/attitude.

Answer:

C. chip on his shoulder