A proposes, by letter sent by post, to sell his house to B. The proposal of A is accepted by B by letter sent by post. When can A revoke his proposal?

A proposes, by letter sent by post, to sell his house to B. The proposal of A is accepted by B by letter sent by post. When can A revoke his proposal? Correct Answer A can revoke proposal at any time before B sent letter of acceptance

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A proposes, by a letter sent by post, to sell his house to B. When is the last point of time when A can revoke the proposal?
A' proposes by letter to sell a house to 'B' at a certain price. The communication of proposal is complete when