The answer choice C. Reason being, "Erika stood in Mr. Kelp's room with her hands shaking and her teeth chattering" basically it's saying she was nervous about we she had done.
Answer choice A isn't the answer because she's not trying distract Mr. Kelp.
Answer choice B isn't the answer because it clearly states that she is terrified. Which is why she is shaking and her teeth are chattering.
Answer choice D wouldn't be the answer because it doesn't describe the room being cold. She snatched a blank test when Mr. Kelp stepped out, which is why she was nervous.
