Concept:A food chain represents the feeding positions through which energy moves from producers to consumers.Explanation:Each step in a food chain is known as a trophic level.Producers make up the first trophic level.Primary consumers form the second trophic level.Secondary and tertiary consumers occupy the higher trophic levels.Therefore, the feeding stages shown in the food chain correspond to trophic levels, not energy levels or a food web.Answer:B. trophic level