Find out whether there is any grammatical error in below sentence. The thief broke in the / house at the / dead of night

The correct answer is: D.

The sentence is grammatically correct. The word “dead” is an adjective that modifies the noun “night.” The sentence means that the thief broke into the house at a time when it was very dark.

The other options are incorrect because they contain grammatical errors. Option A is incorrect because it does not include the word “at.” Option B is incorrect because it does not include the word “the.” Option C is incorrect because it does not include the word “dead.”