The change in the internal energy of the system is

Question

A closed gaseous system undergoes a reversible constant pressure process at 2 bar in which 100kJ of heat is rejected and the volume change from 0.2m³ to 0.1m³. The change in the internal energy of the system is                   

(a) -100 kJ                   (b) -80 kJ

(c) -60 kJ                     (d) -40 kJ