Prokaryotic Cells Generally Are Smaller Than Eukaryotic Cells

Prokaryotic cells generally are smaller than eukaryotic cells.Which of the following is the most likely explanation for this difference?

A) Prokaryotes have more diverse energy sources.
B) Prokaryotes have a capsule that limits cell growth.
C) The rigid cell wall of prokaryotes limits cell size.
D) Prokaryotes lack the genetic material needed for protein synthesis.
E) Eukaryotes have compartmentalization,which allows them to be structurally and functionally more complex.