Which of the Following Hypothetical Observations, If True, Would Disprove

Multiple Choice

Which of the following hypothetical observations, if true, would disprove a prediction of the Big Bang theory?

A) the discovery of two galaxies at the same distance, moving away with slightly different speeds
B) the discovery of a galaxy moving toward us
C) the discovery that the temperature of the universe is only 2.73 K
D) the discovery of a galaxy with 10% helium abundance
E) the discovery of a galaxy with 30% helium abundance