Which one did Rutherford consider to be supported by the results of experiments in which $\alpha - $ particles were scattered by gold foil?

• A
  The nucleus of an atom is held together by forces which are much stronger than electrical or gravitational forces.
• B
  The force of repulsion between an atomic nucleus and an $\alpha - $ particle varies with distance according to inverse square law.
• C
  $\alpha - $ particles are nuclei of Helium atoms.
• D
  Atoms can exist with a series of discrete energy levels.