4.
A:
Cannot be revoked by ‘Y’ as he has already accepted the offer and dropped the letter of acceptance
B:
Can be revoked by ‘Y’ as soon as the letter of acceptance reaches ‘X’
C:
Can be revoked by ‘Y’ before the letter of acceptance reaches ‘X’
D:
Can be revoked by ‘Y’ at any time after the letter of acceptance reaches ‘X’
The answer is: C