In contemplation of death during risky surgery, Carl, a guitarist, gives his favorite guitar to Mitchell. Unfortunately, the surgery does not go well and Carl dies. Carl's family seeks to get the guitar back from Mitchell. a. The family is entitled to the return of the guitar because the gift was revoked when Carl died. b. The family is entitled to the return of the guitar because they had a closer relationship to Carl than Mitchell did. c. Mitchell may keep the guitar, because it is a gift causa mortis. d. Mitchell may keep the guitar because it is an inter vivos gift.