Directions: Read each sentence to find out whether there is any grammatical error in it. The error, if any will be in one part of the sentence. The letter of that part is the answer.
We had a long discussion at a cup of coffee.

Options

A. A) We had
B. B) of coffee
C. C) at a cup
D. D) a long discussion

Answer

C

Explanation

The preposition "over" must be used with "discussion" and it will replace .at. to make the sentence grammatically correct. Hence, .over a cup. will be answer.