Assertion (A) : Within the mesosphere, temperature decreases with increasing altitude.
Reason (R) : This is due to decreasing solar heating and increasing cooling by CO2 radiative emission
(a) If (A) and (R) are correct and (R) is the correct explanation of (A)
(b) If (A) and (R) are correct but (R) is not the correct explaination of (A)
(c) If (A) is true but (R) is false
(d) If (A) is false but (R) is true