During a reversible isothermal expansion of an ideal gas, the entropy change is_________________?

A. 100
B. 50
C. 205
D. 200

A. Pressure
B. Composition
C. Temperature
D. All (A), B. and (C)

A. (∂T/∂V)S, ni = -(∂P/∂S)V, ni
B. (∂S/∂P)T, ni = (∂V/∂T)P, ni
C. (∂S/∂V)T, ni = (∂P/∂T)V, ni
D. (∂T/∂P)S, ni = (∂V/∂S)P, ni

A. Hour
B. Day
C. Minute
D. Second

A. Pressure
B. Temperature
C. Both A. & B
D. Neither A. nor B