Which of the following genuses serves as space food?

Chlorella is a genus of single-celled green algae that has been extensively researched by NASA and other space agencies as a potential food source for long-duration space missions. It grows rapidly, requires minimal space and resources, can produce oxygen through photosynthesis, and is rich in protein, vitamins, and minerals. While not yet standard operational space food, it remains the most studied and promising space food candidate among the options listed.