(A) Food web
When organisms of a higher trophic level feed on several types of organisms of a lower trophic level, the interconnected feeding relationships form a food web.
The passage states: "Each organism is generally eaten by two or more other kinds of organisms which in turn are eaten by several other organisms. So instead of a straight line food chain, the relationship can be shown as a series of branching lines called a food web." This branching/multiple feeding relationship is the key feature that distinguishes a food web from a simple food chain. A food chain is linear (one → one); a food web involves multiple feeding links across trophic levels.