Assertion: `C_(P)-C_(V)=R` for an ideal gas.
Reason: `((delE)/(delV))_(T)=0` for an ideal gas.
A. If both A and R are correct and R is the correct explanation of A
B. If both A and R are correct but R is not the correct explanation of A
C. If A is correct but R is incorrect
D. If A is incorrect but R is correct
