Me with this! i'd appreciate it. i'm willing to give brainliest. (:

The answer to your question is The third one

Explanation:

First one: is a polar molecule because oxygen is a large atom compared  with hydrogen that causes dipoles.

Second one: it's a polar molecule, we can see that it is polar for the 2 points next to nytrogen.

Third one: it's a non polar molecule.

Fourth one: it's a polar molecule, the explanation is the same that water.

one negative thing it that it can kill water animals. another negative thing is it can cause the destruction of ecosystem. one way water pollution can be reduced is to conserve energy.