[单选题]
13.31: A monatomic ideal gas undergoes a reverhi q6)ycd51uesibleexe2 qr*e .r;u isothermal expansion in an enclosed container. ; reqeu*.r2exWhich one of the following quantities associated with the gas has a value of zero?
A. Heat
B. Entropy change
C. Work done
D. Internal energy change
E. Pressure change