Chemistry question 10000 points!

To observe the effects of changing pressure on the volume of a gas, factors that must be kept constant are the gas's temperature and
A.density
B quantity
C.elasticity
D all of the above

B

here is why it aint density

PV = nRT

denity is essential n/V = P/RT

and that relates P and V in direct way - you cant change density you cant do the experiment

A. Density