[单选题]
A gas is quickly compress 0f(8l0l qg s6u y7xsaw1di1wved in an isoi8tng pb.jcy z2 u-u0(lated environment. During the event, the gas exchanged no heyp 0j(bu ut2c.ni g-8zat with its surroundings. This process is
A. isothermal
B. isochoric
C. isobaric
D. adiabatic
