In These Functional Analyses of Behavior, Which One Illustrates an Antecedent

In these functional analyses of behavior, which one illustrates an antecedent to a client's behavior?

A) Driving on the freeway always prompts a panic attack for Elliot.
B) When Janae has a panic attack, she avoids stressful situations.
C) Veronica can get attention if she acts depressed.
D) Thomas learns that refusing to clean his room will cause his mother to clean it.