[单选题]
In an elastic collisiono:)lsy8ka:8ly/w c x ht5.fsp, if the mjq+iywp.8jm b 0u/x*lomentum is conserved, then which of the following statements is true about kwubm*iq xl j+pj.0/8y inetic energy?
A. Kinetic energy is also conserved.
B. Kinetic energy is gained.
C. Kinetic energy is lost.
D. none of the above
