A biochemist isolates, purifies, and combines in a test tube a variety of molecules needed for DNA replication. When she adds some DNA to the mixture, replication occurs, but each DNA molecule...

A biochemist isolates, purifies, and combines in a test tube
a variety of molecules needed for DNA replication. When
she adds some DNA to the mixture, replication occurs, but
each DNA molecule consists of a normal strand paired with
numerous segments of DNA a few hundred nucleotides long.
What has she probably left out of the mixture?
(A) DNA polymerase
(B) DNA ligase
(C) Okazaki fragments
(D) primase