[单选题]
A gas is quickly compressed . xamezl, (vm5myu/t8 in an isolated environmen.s8.y/fgrslezid2 9 mt. During the event, the gas ef9.ir gmses 8/.2d ylzxchanged no heat with its surroundings. This process is
A. isothermal
B. isochoric
C. isobaric
D. adiabatic
