A proposal cannot be revoked:
Verified Answer
A. by failure of the acceptor to fulfil a condition precedent to acceptance
B. by lapse of the time prescribed in the proposal for its acceptance
C. by insanity of the proposer, if the fact of insanity comes to the knowledge of the acceptor before acceptance
D. after the communication of its acceptance is complete
Explanation:
Section 5 of the Indian Contract Act, 1872 states that a proposal may be revoked at any time before the communication of its acceptance is complete as against the proposer, but not afterwards. Options (A), (B), and (C) are all valid ways a proposal can be revoked or lapse (Section 6).