In Which Process Will the Internal Energy of the System

Multiple Choice

In which process will the internal energy of the system NOT change?

A) An adiabatic expansion of an ideal gas.
B) An isothermal compression of an ideal gas.
C) An isobaric expansion of an ideal gas.
D) The freezing of a quantity of liquid at its melting point.
E) The evaporation of a quantity of a liquid at its boiling point.