[单选题]
A gas is quickly compressed in an isolated + 8;o s3bgfb/oqokbm9environment. m(n;ei0;y.9eg jf seab6nm+eDuring the event, the gas exc(0m;esj ;g iemayfn e+ n6b.e9hanged no heat with its surroundings. This process is
A. isothermal
B. isochoric
C. isobaric
D. adiabatic