In Which of the Following Situations Would an Infant Be

In which of the following situations would an infant be bound by the contract he has entered into?

A) A contract for the purchase of a bike with which to race.
B) A government student loan.
C) A contract for the purchase of a new leather jacket, where the merchant was not aware that he had several other jackets at home.
D) A contract for the purchase of theatre tickets.
E) A written contract for the purchase of a new stereo.