Assertion (A): The thickness of the atmosphere is the maximum over the equator. Reason (R): High insulation and strong convection currents occur over the equator.

• A.  Both A are 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 fast false but R is true