18. Which of the following statements is true in the special relativity? (A) Kinetic energy is p²/(2m), where p is momentum and m is rest mass. (B) A person can still see his/her image reflecting from a mirror, as he/she is moving close to the speed of light. (C) Since E=mc² and the rest mass of a photon is zero, the energy of a photon is zero. (D) The momentum p is equal to the rest mass times the velocity.