Which one of the following states Boyle's law correctly?

A. Volume and temperature remaining constant, the mass of any gas is inversely proportional to its pressure
B. Temperature remaining constant, the volume of a given mass of any gas is inversely proportional to its pressure
C. Temperature remaining constant, the volume of a given mass of any gas is directly proportional to its pressure
D. The volume of a given mass of any gas is directly proportional to the product of its temperature and pressure