[单选题]
If the pressure actia9 mfnr i6py.5h.dav/ ng on an if jga2k4sa gu hj,awwgx( (;61deal gas at constant temperature is tripled, its vol4a j wuaxgj,;(2kg(sfa6w h1gume 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.
