The correct option is
B Food chain and food web is complex
A climax community is a biological community of living organism formed through the process of ecological succession has reached a steady state.
This equilibrium occurs because the climax community is composed of species best adapted to average conditions in that area. A food chain differs from a food web
because the complex network of different animal's feeding relations are aggregated and the chain only follows a direct, linear pathway of one animal at a time. Thus, the correct answer is option B.