One Day You Are Out Biking on a Relatively Deserted

One day you are out biking on a relatively deserted trail.You see a fellow cyclist on the side of the trail with the bike's wheels in the air.When will you be most likely to help?

A) When you know nothing about bikes but can offer moral support
B) When you know a great deal about bikes and work at a bicycle repair shop
C) When the cyclist seems to know more about bikes than you do
D) When you have just finished your trail ride
E) When you are in a rush to get to an important appointment