The correct option is
C ChlorellaChlorella is a fresh water, single-celled algae, that grows in fresh water.
Chlorella emerged over 2 billion years ago, and was the first form of a plant with a well-defined nucleus. It is a potential food source because it is high in protein and other essential nutrients; when dried, it is about 45% protein, 20% fat, 20% carbohydrate, 5% fibre and 10% minerals and vitamins. It is also abundant in calories and vitamins.
Thus, the correct answer is option A.