Dye sent hill a written offer to sell a tract of land located in new town for $60,000. the parties were engaged in a separate dispute. the offer stated that it would be irrevocable for 60 days if hill would promise to refrain from suing dye during this time. hill promptly delivered a promise not to sue during the term of the offer and to forego suit if hill accepted the offer. dye subsequently decided that the possible suit by hill was groundless and therefore phoned hill and revoked the offer 15 days after making it. hill mailed an acceptance on the 20th day. dye did not reply. under the circumstances,
a. dye's offer was supported by consideration and was not revocable when acceptedb. dye's written offer would be irrevocable even without considerationc. dye's silence was an acceptance of hill's promised. dye's revocation, not being in writing, was invalid