Assertion (A): During the Sangam age the land tax was the largest source of income.
Reason (R): It was charged at the rate of 1/4 of the produce.
(A) Both A and R are true and R is the correct explanation of A
(B) Both A and R are true but R is not the correct explanation of A
(C) A is true but R is false
(D) A is false but R is true