Assertion : Heavy water preferred over ordinary water as a moderator in reactors.
Reason: Heavy water, used for slowing down the neutrons, has lesser absorption probability of neutrons than ordinary water.
(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 correct explanation of A
(c) A is true but R is false
(d) A and R are false