[单选题]
If the pressure acting on an idpin.p6f+bydzr5* 1g qeq x/ya+-qs v* t11hznval gas at constant temperature is tripled, its voxv 1tzh1s+n-y/*q vaqlume is
A. reduced to one-third.
B. increased by a factor of three.
C. increased by a factor of two.
D. reduced to one-half.
