The figure shows the P-V plot of an ideal gas taken through a cycle ABCDA. The part ABC is a semi-circle and CDA is half of an ellipse. Then,

Options

A. the process during the path A `to` B is isothermal
B. heat flows out of the gas during the path B `to` C `to` D
C. work done during the path A `to` B `to`C is zero
D. positive work is done by the gas in the cycle ABCDA

Answer

B