One mole of an ideal gas is taken from state `A` to state `B` by three different processes (a) `ACB`, (b) `ADB` and (c ) `AEB` as shown in the `P - V` diagram. The heat absorbed by the gas is
A. greater in process (b) than in (a)
B. the least in process (b)
C. the same in (a) and (c )
D. less in (c ) than in (b)