Yolanda Found a Better Job and Quit Robert's Employment

Yolanda found a better job and quit Robert's employment.Yolanda,however,wants to sue Robert because she believes that he may have terminated her employment based on age discrimination if she had not quit.At this point,which of the following would be Robert's best defense to a lawsuit filed by Yolanda in the state in which she worked?

A) That the court lacks in personam jurisdiction.
B) That the case is moot.
C) That the state's long-arm statute does not apply.
D) That a default judgment is appropriate.
E) That Yolanda lacks standing.