Assertion: At constant temperature, if pressure on the gas is doubled, density is also doubled.
Reason: At constant temperature, molecular mass of a gas is directly proportional to the density and inversely proportional to the pressure
A. If both A and R are true and R is the correct explanation of A
B. If both A and R are true but R is not the correct explanation of A
C. If A is true but R is false
D. If both A and R are false