Assuming Temperature Remains Constant, What Happens to the Density of a Gas

Multiple Choice

Assuming temperature remains constant, what happens to the density of a gas as the gas is compressed into a smaller volume?

A) The density of the gas decreases along with the decreasing volume.
B) The density of the gas increases along with the decreasing volume.
C) The density of the gas stays the same because it is an intrinsic property of a material.
D) The density increases because of an increase in mass.