Read the following statements and choose the correct option.
Assertion (A): Firewood and fossil fuels are the two main conventional energy sources.
Reason (R): Conventional sources of energy are those which have been in common use for a long time.
1
Both (A) and (R) are true and (R) is the correct explanation of (A).
2
Both (A) and (R) are true but (R) is not the correct explanation of (A).
3
(A) is true but (R) is false.
4
Both (A) and (R) are false.