A monochromatic source of light is placed at a large distanced from a metal surface. Photoelectrons are ejected at rate n, the kinetic energy being E. If the source is brought nearer to distance d/2,the rate and kinetic energy per photoelectron become nearly

• A

  2n and 2E

• B

  4n and 4E

• C

  4n and E

• D

  n and 4E