[单选题]
A sample of an ideal gasct :27k *f kl 7m*uhy9gy-uohv is heata 8(j7s7yhpsm( q); lrhyc4dv ed and its Kelvin temperature doubles. What happens to the average speed of the 7jd ymsq7a y(vch(hr)p;4ls8molecules in the sample?
A. It does not change.
B. It doubles.
C. It halves.
D. none of the above
