Which One of the Following Is Definitely an Example of Trait

Which one of the following is definitely an example of trait anxiety?

A) Jan runs faster than usual when she is chased by a pit bull across school grounds.
B) Tom becomes nauseous every time he takes a test.
C) Zack did not pass the last math test, but he has done well on previous math tests.
D) Johanne draws a blank the first time he reads an essay question.