Suppose That We Allow an Ideal Gas Containing $N$ Molecules to Expand Slowly and Adiabatically to Twice Its Initial

Multiple Choice

Suppose that we allow an ideal gas containing $N$ molecules to expand slowly and adiabatically to twice its initial volume. By what factor does its multiplicity increase?

A) By a factor of 2 .
B) By a factor of $2^{N}$ .
C) The multiplicity does not change.
D) The answer depends on the gas's initial volume.
E) The answer depends on the gas's initial energy.