The answer is the first one (A): Autotrophs.
Explanation for each option:
A) Autotrophs - Correct. Autotrophs are organisms that can produce their own food using light, water, carbon dioxide, or other chemicals. Photosynthesis is a process used by plants, algae, and some bacteria to convert light energy into chemical energy stored in glucose, a type of sugar.
B) Sharks - Incorrect. Sharks are heterotrophic organisms, meaning they cannot produce their own food and must consume other organisms to obtain energy.
C) Heterotrophs - Incorrect. Heterotrophs are organisms that cannot synthesize their own food and rely on other sources of organic carbon, mainly plant or animal matter, for nutrition.
D) Frogs - Incorrect. Frogs are also heterotrophs, as they consume insects and other small animals for energy.
In summary, autotrophs are the organisms that utilize photosynthesis to produce food.