what proteins are crucial for creating and maintaining DNA replication forks?

what proteins are crucial for creating and maintaining DNA replication forks?

A. Helicase creates the replication fork; primase keeps the single strands from closing shut.

B. Helicase creates the replication fork; single-strand binding proteins keep the single strands from reuniting.

C. Ligase creates the replication fork; DNA polymerase II keeps the single strands from reuniting.

D. Helicase creates the replication fork; ligase keeps the single strands from closing shut.