Fill in the blank with the most appropriate option.
Sentinels were posted lest the camp _______ be taken by surprise.

Correct option is B

The correct option to fill in the blank is (b) should.
Explanation: After “lest,” the subjunctive mood is used, and the correct structure is “lest + subject + should + verb”.
Example: He ran fast lest he should miss the train.
Why other options are incorrect:
· (a) will: Incorrect after “lest.”
· (c) must: Not used in this construction.
· (d) would: Incorrect in subjunctive/negative purpose clauses.
�� Information Booster: “Lest” means “for fear that” and is always followed by should + base verb.