16. In which of the following changes is the work done by the system the largest at 25°C? (A) an isothermal reversible expansion of an ideal gas from 1 L to 10 L (B) an isothermal expansion of an ideal gas from 1 L to 10 L against an opposing pressure of 5 atm (C) an isothermal free expansion of an ideal gas from 1 L to 10 L (D) an isothermal expansion of an ideal gas from 1 L to 10 L against an opposing pressure of 1 atm (E) The work is the same for all these processes.