[单选题]
In an elastic collisis1rsiyw+i:8 x,q +kb mooem tk4 re4,1ro+9a dfn, if the momentum is conserved, then which of the following statements iser,t94of 1o mak r+ed4 true about kinetic energy?
A. Kinetic energy is also conserved.
B. Kinetic energy is gained.
C. Kinetic energy is lost.
D. none of the above
