An ideal gas undergoes a cyclic process as shown in Figure.

$$\Delta U_{BC} = -5$$ kJ mol$$^{-1}$$, $$q_{AB} = 2$$ kJ mol$$^{-1}$$
$$W_{AB} = -5$$ kJ mol$$^{-1}$$, $$W_{CA} = 3$$ kJ mol$$^{-1}$$
Heat absorbed by the system during process CA is:

A

-5 kJ mol$$^{-1}$$

B

+5 kJ mol$$^{-1}$$

C

18 kJ mol$$^{-1}$$

D

-18 kJ mol$$^{-1}$$