12) There are two statements marked as Assertion (A) and Reason (R). Mark your answer as per the codes provided below: Assertion (A): The atmosphere is the thin layer of the earth that surrounds the earth. The gravitational force of the earth holds the atmosphere around it. Reason :(R): The atmosphere protects us from the harmful rays of the Sun and the changes in the atmosphere produce changes in the weather and climate.
a) A is true, but R is false.
b) A is false, but R is true.
c) Both A and R are true, and R is the correct explanation of A.
d) Both A and R are true, but R is not the correct explanation of A. ​