The correct option is
C Prokaryotes
Prokaryotes are unicellular organisms without membrane-bound organelles like mitochondria, golgi complex. They lack true nucleus. Instead, they have nucleoid, genetic material without nuclear envelope. The examples of prokaryotes include bacteria,
Cyanobacteria (Blue green algae). Blue green algae are photosynthetic bacteria.
Thus, the correct answer is 'Prokaryotes.'