Final answer:
The prokaryotic sliding clamps are made up of two polypeptides, forming a dimer that aids in DNA replication.
Step-by-step explanation:
The sliding clamps of prokaryotes, which are an essential component of the DNA polymerase III holoenzyme, are made up of two polypeptides. These are known as the β-sliding clamps in prokaryotes, and they form a dimer that allows DNA polymerase to stay attached to the DNA strand, facilitating rapid and efficient replication. So, the answer to the question is b) Two.