"Fifteen human DNA polymerases have been identified. Which of the following statements about them is true?

A) They all are involved in DNA replication. 
B) One of the DNA polymerases opens the replication fork, one forms the primer, another removes the primer, and the rest are involved in protein synthesis. 
C) The functions of DNA polymerase, helicase, and primase are known; the functions of the others are
unknown. 
D) Each DNA polymerase requires a specific primer to function.
E) Most replications are catalyzed by delta and epsilon DNA polymerases; the others are involved in primer removal and DNA repair."