Which of these orderings of the epochs is correct?

Which of these orderings of the epochs is correct?
 
  A) nuclear, stellar, galactic
  B) quark, lepton, atomic
  C) Planck, lepton, quark
  D) nuclear, lepton, quark
  E) Planck, stellar, galactic

Question 2

The first attempt to map the Galaxy via star counts was done by:
 
  A) Galileo in 1612.
  B) William Herschel in the late eighteenth century.
  C) Edward Barnard with long exposure photos about 1900.
  D) Harlow Shapley with the RR Lyrae variables in 1920.
  E) Edwin Hubble with the new 100 Mt. Wilson telescope in the 1930s.

Question 3

Explain the stage in which the solar system formed pretty much in a plane.
 
  What will be an ideal response?