The volume (V) of a monatomic gas varies with its temperature (T), as shown in the graph. The ratio of work done by the gas, to the heat absorbed by it, when it undergoes a change from state A to state B, is

A

$$\frac{2}{7}$$

B

$$\frac{1}{3}$$

C

$$\frac{2}{3}$$

D

$$\frac{2}{5}$$