Answer:
The correct option is B: "A revocation generally is effective when received, and an acceptance generally is effective when dispatched."
Explanation:
In revocation and acceptance of contract offers, the mailbox rule comes to limelight. This means that a revocation is effective when it is received and an acceptance is termed effective when it has been dispatched. The mailbox rule asserts that a contract is formed if an acceptance is dispatched by the offeree prior to receiving a revocation which was sent by the offeror.