In Which of the Following Situations Has a Mutual Benefit

In which of the following situations has a mutual benefit bailment been created?

A) A restaurant customer hangs her coat on a self-service coat rack next to the table at which she is dining.
B) Bob borrows his friend's tractor.
C) Ruby drops her parrot off at her neighbor's house for her to look after while Ruby is on vacation.
D) For a minimal fee, Nadine checks her faux fox coat with the check service offered at a restaurant.