In the following questions, a sentence/a part of the sentence is written in bold. Below are given alternatives to the bold part which may improve the sentence. Choose the correct alternative. In case no improvement is needed, choose No Improvemen
Please send the letter on the address given below.

Options

A. to
B. No Improvement
C. at
D. upon

Answer

C

Explanation

It is Preposition related error. at (Prep.) is the right usage.. Ifwe mention the building where something is/where something happens we use at. (The Free Dictionary by Farlex)
For exact address also at is used. (Dave.s Esl Cafe)