Two Moles of an Ideal Gas Have an Initial Kelvin

Multiple Choice

Two moles of an ideal gas have an initial Kelvin temperature Tᵢ and absolute pressure Pᵢ.The gas undergoes a reversible isothermal compression from an initial volume Vᵢ to a final volume 0.5Vᵢ.
-What is the change in entropy of the sample?

A) +8.31 (ln 2) J/K
B) -8.31 (ln 2) J/K
C) +16.62 (ln 2) J/K
D) -16.62 (ln 2) J/K
E) zero J/K