Consider the following statements:

Assertion (A): Water boils at a temperature below 100° at higher altitude.

Reason (R): Low Boiling point at higher altitudes.

Select the correct answer from the below given options: 

a) Both (A) and (R) are individually true and (R) is the correct explanation of (A).
b) Both (A) and (R) are individually true and (R) is not the correct explanation of (A).
c) A is false, but R is true
d) A is true, but R is false