The offeror has the power to require a particular manner of acceptance. The offeror may require acceptance via: a promise, a promise communicated in a certain way, a promise made in a certain time, and so on; or via: a particular act, a particular act performed in a certain place, or with in a certain time, and so on. See Restatement (Second) of Contracts ยง 30(1).
Rupert could have required a particular manner of acceptance. He could have said, "You must accept this offer by communicating in a letter, sent in a reasonable amount of time after receiving this letter, a promise to come to California and care for us."
True or False - In this case, Frank and Caro could only accept the offer by communicating in a letter, sent in a reasonable amount of time after receiving Rupert's letter, a promise to come to California and care for Rupert and Blanche.