Select the most appropriate option for the given blank.
You must ______________ your defeat now, as you are left with no soldiers.

Correct option is B

The correct option to fill in the blank is (b) admit.
"Admit" is the appropriate verb here, as it means to accept or acknowledge defeat. This fits the context of the sentence, where the person is left with no other option but to concede.
Meanings of other options:
Defer: Means to postpone or delay.
Buy: Doesn’t fit the context of admitting defeat.
Get: Doesn’t align with the context of accepting defeat.