Chu,a Non-Swimmer,fell Off a Boat into the Lake

Chu,a non-swimmer,fell off a boat into the lake."Help!" he cried."$100 to the person who saves me!" Frances then jumped in and held Chu's head above water until the boat's dinghy could reach them.

A) Chu must pay Frances the reward since,by her action,she accepted his offer and gave consideration for his promise.
B) Since Frances did not accept his offer,although what she did would have been consideration if there had been a contract,the offer is revocable and he need not pay her $100.
C) If Frances had been under a legal duty to save Chu,even if there was a contract that he should pay her $100 for the rescue,Chu will not have to pay her.
D) Chu must pay Frances the reward since,by her action,she accepted his offer and gave consideration for his promise and if Frances had been under a legal duty to save Chu,even if there was a contract that he should pay her $100 for the rescue,Chu will not have to pay her.
E) All of the responses are correct.