Assertion (A) : Thickness of the atmosphere is maximum over the Equator.
Reason (R) : High insolation and strong convection currents occur over the Equator.
(a) Both A and R are individually true and R is the correct explanation of A
(b) Both A and R are individually 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