In the following questions, a part of the sentence is printed in bold. Below are given alternatives to the bold part at (1), (2) and (3) which may improve the sentence. Choose the correct alternative.In case no improvement is needed your answer is (4).
I complimented Raju for his promotion.

Options

A. with
B. on
C. about
D. No Improvement

Answer

B

Explanation

(2) compliment (Verb) agrees with on (Prep.)
Here, on Prep.) is the right usage.