Choose the correct alternative from the following : - Assertion (A) : Simla is colder than Delhi.
Reason (R) : Simla is at a higher altitude as compared to Delhi.

Answer: A. Both A and R are true and R is the correct explanation of A.

Simla is colder than Delhi because it is situated at a higher altitude and temperature decreases by 1° C for every 165 metres of ascent.