Plasmid $pBR322$ has a $PstI$ restriction enzyme site within the gene $amp^R$ that confers ampicillin resistance. If this enzyme is used for inserting a gene for $\beta$-galactosidase production and the recombinant plasmid is inserted into an $E. coli$ strain:

• A
  it will not be able to confer ampicillin resistance to the host cell.
• B
  the transformed cells will have the ability to resist ampicillin as well as produce $\beta$-galactosidase.
• C
  it will lead to lysis of the host cell.
• D
  it will be able to produce a novel protein with dual ability.