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C is corrent. Normally under the common law, an acceptance is considered to be effective when sent by the offeree as long as the acceptance was sent by means specified in the offer or by the same means used to communicate the offer. However, the offeror may stipulate that the acceptance is effective only when received by the offeror. In this case, Mirk stipulated that Carr’s acceptance would only be effective when received by Mirk. Thus, since Mirk did not receive the acceptance until July 2 (after the July 1 deadline), this acceptance is invalid.
A is incorrect. Mirk did not receive the acceptance until after the July 1 deadline.
B is incorrect. An offeror may hold an offer open for as long as is desired.
D is incorrect. The offeror has stipulated that acceptance would only be effective when received by the offeror.