The `P – V` diagram of a system undergoing thermodynamic transformation is shown in figure. The work done by the system in going from `A rarr B rarr C is 30 J` and `40 J` heat is given to the system. The change in internal energy between `A and C` is

A. 10 J
B. 70 J
C. 84 J
D. 134 J

A. 10 J
B. 70 J
C. 84 J
D. 134 J
Correct Answer – a