Assertion (A): The origin of feudal system in ancient India can be traced to military campaigns.
Reason (R): There was considerable expansion of the feudal system during the Gupta period.
(a) Both A and R are true but R is the correct explanation of A
(b) Both A and R are true but R is not a correct explanation of A
(c) A is true but R is false
(d) A is false but R is true