Which statement explains the most realistic way to model energy flow in an ecosystem?

A food chain is most realistic because many organisms eat one type of food, and energy moves through a single pathway.
A food chain is most realistic because many organisms eat a variety of foods, and energy moves through different pathways.
A food web is most realistic because many organisms eat one type of food, and energy moves through a single pathway.
A food web is most realistic because many organisms eat a variety of foods, and energy moves through different pathways.