In E Coli, There Is a Mutation in a Gene Called

In E. coli, there is a mutation in a gene called dnaB that alters the helicase that normally acts at the origin. Which of the following would you expect as a result of this mutation?

A) No proofreading will occur.
B) The DNA strands at the origin of replication will separate, but replication will not progress.
C) The DNA will supercoil.
D) Replication will require a DNA template from another source.