Celeste Is Walking Along the Street One Day When She

Celeste is walking along the street one day when she sees that a blood-donor clinic is in progress. She is least likely to stop and give blood if she

A) knows someone who requires frequent blood transfusions.
B) is just out for a walk, with nowhere she has to get to.
C) is on her way to do something really fun.
D) none of these choices-there's no predicting when someone will help.