Johnny Sees His Brother-In-Law Tom One Night Outside a Club

Johnny sees his brother-in-law Tom one night outside a club.Tom is clearly drunk and barely recognises Johnny.Johnny offers to get Tom home safely if Tom will lend Johnny his motorcycle the following weekend.Johnny gets Tom home safely but the following weekend Tom refuses to give Johnny his motorcycle.Which of the following is true?

A) There is a contract between Johnny and Tom of which Tom is now in breach.
B) Johnny cannot enforce Tom's promise because he did not provide consideration.
C) The contract is unlikely to be enforceable due to Tom's lack of contractual capacity.
D) The contract is unenforceable because it was not in writing.