Which Is an Example of Triggering

Which is an example of triggering?

A) You forgot to take your medicine until you hear someone mentioning taking vitamins; a trigger is a stimulus that helps you retrieve information.
B) You hear news so shocking you completely forget your noon meeting; a trigger is surprising information that blocks out memory.
C) A friend criticizes you in public; a trigger is a harsh criticism.
D) Your prejudice keeps you from processing information fairly; a trigger is a bias or prejudice that keeps someone from being fair.