Which One of the Following Is the Best Example of State

Which one of the following is the best example of state anxiety rather than trait anxiety?

A) Thea is often nervous in math class, where she rarely participates unless her teacher specifically calls on her.She sits quietly at her desk, and she does not interact with her classmates because she finds it difficult to do so without shaking.
B) Ursula is an excellent student, but she has considerable trouble speaking to others in any of her classes.She performs very well on tests and other written work, but she gets exceptionally anxious during group work and oral reports.
C) Viola becomes nervous when she has to give a presentation in front of her English class.This is the first time she has ever had to do something like this and she doesn't know how well she will do.
D) Wendell becomes nervous whenever he has to take any kind of paper-pencil test, even when he knows what questions are going to be on the test and is thoroughly prepared.