Heat Is Added to a Sample of an Ideal Monatomic

Multiple Choice

Heat is added to a sample of an ideal monatomic gas.Which one of the following statements is necessarily true?

A) The gas must expand.
B) The gas must do work.
C) The type of change that will occur depends on the conditions of the gas when the heat was added.
D) The gas must change phase.
E) The temperature of the gas must increase.