PIMSO 2023 - Science - Primary 4 - National Round Question 3

Which of the following trophic models demonstrates omnivory in an ecological community?
Reference: Bascompte J, Melián CJ. Simple trophic modules for complex food webs. Ecology 86(11):2868–73 (2005).
A.
B.
C.
D.
E.
Editorial response: Explain the scientific reasoning and any limitation of the original choices.