"Seeds" Around Which Galaxies, Clusters and Walls Grew May Have

"Seeds" around which galaxies, clusters and walls grew may have been_____before inflation and recombination.

A) caused by hot dark matter
B) caused by baryons
C) the result of the separation of the electromagnetic and weak forces
D) the result of freezing water molecules shortly after the universe became transparent to photons
E) caused by initially tiny quantum mechanical fluctuations in space-time