Answer:
(c) unicellular eukaryotic
Step-by-step explanation:
Firstly, all prokaryotic cells are unicellular, they cannot be multicellular, so be cannot be correct.
Both Chlamydomonas and Paramoecium are single-celled organisms, so must be unicellular prokaryotic (a) or unicellular eukaryotic (c).
Chlamydomonas and Paramoecium are eukaryotic. They have membrane-bound organelles like a nucleus and food vacuoles. They are examples of protists.