Before organisms with nuclei evolved, life on earth consisted only of unicellular?

C. prokaryotes

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answer; /// i believe that the correct answer is (c)

C. Prokaryotes

Prokaryotes are unicellular organisms that lack nucleus and other organelles such as mitochondria due to the absence of internal membranes. Furthermore, the cell membrane in prokaryotes is made up of phospholipids which constitute the cells primary osmotic barriers. However, many prokaryotes contain circular DNA molecules commonly refer to as plasmids.

Prokaryotic is the unicellular organisms that lacks membrane bound nucleus. Eukaryotes have nuclei,fungi, protest are subsets.It is microscopic single celled organisms with distant nucleus.