Which One of the Following Is Definitely an Example of Trait

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

A) Tommy becomes nauseous every time he takes a test.
B) Jan runs faster than usual when she is chased by a pit bull across school grounds.
C) Zack did not pass the last math test, but he has done well on previous math tests.
D) Joe initially draws a blank when he reads the first question on his social studies test, but he soon retrieves a reasonable answer.