Bob Owns a Life Estate in a Ranch in Idaho

Bob owns a life estate in a ranch in Idaho.This means that:

A) he can live on the ranch as long as he lives, but if he moves off the ranch, he loses it.
B) he can live on the ranch as long as he lives, or he can sell this right to someone else.
C) Bob or his immediate family can live on the ranch, so long as at least one of them is still living.
D) Bob must live on the ranch for the rest of his life.
E) if Bob sells his life estate to Barbara, she will be able to live on the ranch for the remainder of her life.