With reference to effect of green house gases, Which of the following is/are true?

Q. With reference to effect of green house gases, Which of the following is/are true?

1. Changes to plant growth and nutrition levels

2. Ozone depletion

3. Smog pollution

Select the correct answer from the following codes

A.            a.Only 1

B.            b. Only 1 and 2

C.            c. Only 2 and 3

D.            d. 1,2 and 3

Answer: 1,2 and 3