The Big Bang Theory Seems to Explain How Elements Were

Multiple Choice

The Big Bang theory seems to explain how elements were formed during the first few minutes after the Big Bang.Which hypothetical observation below (these are not real observations) would call our current theory into question?

A) the discovery of a star-like object made entirely of carbon and oxygen
B) the discovery of a planet that with no helium in its atmosphere
C) the discovery of a galaxy with a helium abundance of only 10% by mass
D) the discovery of a galaxy with 27% helium rather than the 25% that theory tells us was produced in the Big Bang