A monoclonal antibody differs from a polyclonal antibody in that monoclonal antibodies:

• A

  are labeled with chemicals that can be visualized.
• B

  are produced by cells from the same organism that produced the antigen.
• Correct answer
  C

  are synthesized by a population of identical, or "cloned," cells.
• D

  are synthesized only in living organisms.

Hence, the correct answer is option: 'C'.