The correct option is A Volvox
Volvox is a genus of chlorophytes, a type of green algae. It exists as a grand spherical colony. Each little alga within the colony bears two flagella, whip-like hairs. The cells have eye spots, more developed near the anterior, which enable the colony to swim towards light. The individual algae in some species are interconnected by thin strands of cytoplasm, called as protoplasmates.