A Biologist Uses a Time Machine to Collect Living Material

A biologist uses a time machine to collect living material from 2 different time periods.Sample A is 3 billion years old and sample B is 1.5 billion years old.How would these samples differ?

A) Prokaryotic organisms would be abundant in sample A but absent from sample B.
B) Eukaryotic organisms would be present in both samples but much more common in sample B.
C) Prokaryotic organisms would only occur in sample B.
D) Eukaryotic organisms would be absent from sample A.