Replication of DNA Must Be Discontinuous on at Least One

Multiple Choice

Replication of DNA must be discontinuous on at least one strand because

A) nicks are required for the unwinding of supercoils.
B) the to 5' exonuclease continually introduces nicks in the new DNA.
C) the direction of polymerization is always 5' to while the two strands being copied in the replication fork are antiparallel.
D) fork movement is bidirectional.
E) RNA primers are used.