Find the underlined part that needs correction in the following question

Ex 2: Find the underlined part that needs correction in the following question.
1. Noise pollution can have a negative effect in both human health and wildlife.
A. Noise pollution            B. have          C. in            D. wildlife
2. If you don't pay attention , you will understand the lesson .
A. pay             B. will            C. understand         D. lesson
3. It is too hot today - please turn on the air condition.
A. is                B. too              C. on                 D. condition