[单选题]
A monatomic ideal gas is compressed to one-half iss 9rv5r xh:.xts original vf ;co 0el./msqolume during an adiabatic process. The final pressure of the ga;fceo0s ./qlm s
A. increases to twice its original value.
B. increases to less than twice its original value.
C. increases to more than twice its original value.
D. does not change.