Which of the following statements are true?

Q. Which of the following statements are true?

i. Ozone is an air pollutant.

ii. Burning of fuel in the car is a source of Nitrogen Oxide, a type of air pollutant.

iii. Some agricultural processes and farm animals are a source 0f ammonia, an air pollutant

iv. Lead smelters are the only source of Lead

A. i, ii and iii only

B. ii, iii and iv only

C. ii and iii only

D. iii and iv only

Answer: A