How does the size of a eukaryotic organism normally compare to the size of a prokaryotic organism?

A.
Eukaryotes are usually much smaller than prokaryotes.
B.
Eukaryotes and prokaryotes are both usually very large organisms.
C.
Eukaryotes and prokaryotes are both usually very small organisms.
D.
Eukaryotes are usually much larger than prokaryotes.

D. Eukaryotes are usually much larger than prokaryotes.