Choose the correct option:

My sister _____ to Delhi in such circumstances.

need not go

The correct answer is Option (3) → need not go

• The phrase "need not" is a modal auxiliary verb that expresses absence of necessity and is followed by the base verb (without "to").
• "Need not go" correctly conveys that it is not necessary for the sister to go to Delhi.

"My sister need not go to Delhi in such circumstances."