In the context of energy flow through ecosystems, what role do plants primarily play?

• A. They act as apex predators, regulating prey populations at the top of the food web.
• B. They act as primary producers, converting light energy into chemical energy stored in organic molecules.
• C. They act as decomposers, breaking down dead organic matter to release nutrients.
• D. They act as primary consumers, obtaining energy by eating other organisms.

Answer: (B)