[单选题]
A sample of an ideal gas is slowly compressed tor3+b+ dclna) w7 ceuj.w) v,re one-hnqq8 .h77depyyd) a a 6;ovu3calf its original volume with no change in temperature. What happens to the average speed of the moleculav6ch83.dypq)oay 7 7e qund;es in the sample?
A. It does not change.
B. It doubles.
C. It halves.
D. none of the above
