Direction: In these questions, sentences are given with blanks to be filled in with an appropriate word(s). Four alternatives are suggested for each question. Choose the correct alternative out of the four alternatives.
When he saw the fish swimming ______ the river, he was extremely happy.

Options

A. 1) on
B. 2) besides
C. 3) in
D. 4) at

Answer

C

Explanation

Here, in (Prep.) is the right usage.