Concept:This question tests the difference between a simple feeding line and a complex feeding network in an ecosystem.
Explanation:A food chain shows the feeding relationship among a specific set of organisms in a community.
It is a linear sequence, usually starting with a producer, e.g. grass → grasshopper → lizard → hawk.
The arrows indicate the direction of food and energy transfer from one organism to the next.
A food web is formed when many food chains in the same community are connected together.
Pyramids of energy and numbers are only diagrams used to summarise trophic levels, not feeding relationships themselves.
Since the question mentions “a set of members”, the correct relationship is the simple chain.
Answer:C. a food chain