Why Is Only One Copy of DNA Made Per Cell

Multiple Choice

Why is only one copy of DNA made per cell division cycle in eukaryotes despite the presence of multiple origins of replication?

A) There is only one origin of replication per chromosome.
B) The rate of elongation proceeds at a rate that allows only one copy to be made by the time the cell divides.
C) The activity of an S-phase protein kinase controls the formation of the pre-replication complex.
D) Primase is activated by phosphorylation only at the onset of S-phase by S-phase protein kinase.