The Pressure of a Gas in an Isobaric Expansion Remains

Multiple Choice

The pressure of a gas in an isobaric expansion remains constant.In such an expansion,

A) no work is done.
B) work is done by the gas.
C) work is done on the gas.
D) "isobaric" and "expansion" are contradictory terms.
E) work is or is not done depending on whether the temperature of the gas changes.