[单选题]
A sample of an ideal gas is slowly compressed to one-halu+(4kxu )o 4xjeus(ulf its orgc9m:+x3 pmk/z,v i briginal volume with no change in temperature. What happens to the average speed of the molei,zpkv/3m mgc:r+ b9xcules in the sample?
A. It does not change.
B. It doubles.
C. It halves.
D. none of the above
