Question

Which sentence uses commas correctly?

A: Some rain has acid in it and this, can be dangerous .

B: this “acid rain” can kill trees, and , it also poison fish.

C: Water itself is pure but , it may carry poison in it.

D: Take a bellyflop in a pool , and you’ll find that the water feels pretty hard.

( I think it’s C )

Answer 1

D. Take a bellyflop in a pool, and you'll find that the water feels pretty hard.

Answer 2

Answer: Water itself is pure but , it may carry poison in it.

Explanation:

You should put a comma before but only when but is connecting two independent clauses.