Consider the following statements:

Statement-I: Rainfall is one of the reasons for weathering of rocks.

Statement-II: Rain water contains carbon dioxide in solution.

Statement-III: Rain water contains atmospheric oxygen.

Which one of the following is correct in respect of the above statements?

1. (a) Both Statement-II and Statement-III are correct and both of them explain Statement-ICorrect answer
2. (b) Both Statement-II and Statement-III are correct, but only one of them explains Statement-I
3. (c) Only one of the Statements II and III is correct and that explains Statement-I
4. (d) Neither Statement-II nor Statement-III is correct

Answer: (a)