Why Is It Easier for Red Giants to Lose Mass

Why is it easier for red giants to lose mass than main sequence stars?

A) red giants are much hotter on their surfaces, allowing gases to move away
B) red giants are so big, the gravity at their surface (that holds material to the star) is less
C) red giants are made of carbon and oxygen throughout, which escape more easily
D) all red giants explode at the end of their lives
E) you can't fool me, stars lose the same amount of mass during every stage of their lives