The volume V versus temperature T graphs for a certain amount of a perfect gas at two pressure $$P_1 and P_2$$ are as shown in the figure. It can be concluded that

A

The pressure $$P_1$$ is greater than the pressure $$P_2$$

B

The adiabatic index for $$P_1$$ is higher than that for $$P_2$$

C

$$P_1$$ represents monoatomic gas and $$P_2$$ represents diatomic gas

D

None of the above