Which three of the observed phenomena below offer evidence in support of the Big Bang theory?
1. the existence of comets
II. elliptical planetary orbits
III. the energy output of the sun
IV. the cosmic microwave background
V. red shifted light from distant objects
VI. helium makes up 25% of ordinary matter
O A. I, II, III
OB. I, III, V
C. IV, V, VI
OD. II, IV, VI