Final answer:
DnaB helicases bind to DNA with assistance from the DnaC protein and move in a 5' to 3' direction along the lagging strand to facilitate DNA replication.
Step-by-step explanation:
The student's question is about the role of certain proteins in DNA replication. The correct statement is: DnaB helicases bind DNA with the help of the DnaC protein and move in a 5' to 3' direction along the lagging strand template. This corresponds to answer choice 'd'. DnaC aids DnaB helicase in attaching to the DNA. Once bound, the helicase unwinds the DNA double helix to allow for replication. The movement of the helicase, as with all DNA synthesis, occurs in the 5’ to 3’ direction, but on the lagging strand, this movement relative to the replication fork is backward, synthesizing short DNA pieces known as Okazaki fragments which are later joined together.