Assertion (A): An air filled balloon released from the ground goes up and up till it reaches a certain elevation and floats in the air.
Reason (R): With increase in elevation the temperature of the atmospheric air increases and so the density decreases.
a. Both A and 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 false but R is true