Which of the Following Is False with Regard to Contract

Which of the following is False with regard to contract law?

A) A counter-offer ends an offer.
B) A newspaper notice offering to pay a reward for the return of lost kittens is an invitation to treat.
C) An important criterion for determining the place of the contract is the place where the acceptance is effective.
D) An option is a contract in which one person is buying a period of time within which he may accept the offer contained within the option.
E) A revocation is effective only when received.