Stage I DNA Replication in the Bacteriophage $\phi$ X174 Is Carried Out Entirely by Host Cell Proteins

Stage I DNA replication in the bacteriophage $\phi$ X174 is carried out entirely by host cell proteins.Why?

A) DNA replication is required for penetration of the viral genome into the host cell.
B) The bacteriophage $\phi$ X174 does not encode any of its own DNA replication proteins.
C) The phage genome has become integrated into the host genome.
D) Only the host cell proteins can replicate a ssDNA genome.
E) Stage I DNA replication occurs before any viral proteins are expressed.