The correct answer is B: at. The preposition 'at' is used with specific points of time, including 'night'. The standard collocation is 'at night'.
A.in
B.at✓ Correct
C.on
D.into
Explanation
The preposition 'at' is used with specific points of time, including 'night'. The standard collocation is 'at night'. Hence the correct preposition is 'at'.
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