The correct answer is B. Algae.
Autotrophs are organisms that can produce their own food using sunlight or inorganic chemicals. They are the primary producers in an ecosystem and are essential for the food chain.
Fish are heterotrophs, which means they cannot produce
their own food and must consume other organisms to survive.Butterflies are also heterotrophs. They consume nectar and other plant matter.
Mushrooms are heterotrophs that decompose dead organic matter.
Algae are autotrophs that use sunlight to produce food through photosynthesis. They are a diverse group of organisms that can be found in both aquatic and terrestrial environments.