As shown below, two 100 kg astronauts are floating in space. The first astronaut is moving at 4 m/s while the second is at rest. The two astronauts collide. Both astronauts are now moving at 2 m/s. Based on the above information and images, which of the following statements is true? A. Momentum and kinetic energy are both conserved. B. Momentum is conserved but kinetic energy is not conserved. C. Kinetic energy is conserved but momentum is not conserved. D. Neither momentum nor kinetic energy is conserved.