Suppose You Are Asked by the Local Hospital to Donate

Suppose you are asked by the local hospital to donate one of your kidneys to save the life of a stranger.Are you obligated to give away your kidney for a good cause? John Arthur says NO because:

A) transplant kidneys are too scarce to give your kidney away.
B) no one deserves another person's kidney.
C) it's your body,you have a right to it,and that weighs against whatever duty you have to help.
D) it's your body,you have a right to it,and you should never donate your kidney or any other part of your body.