Which one of the following group of organisms forms a food chain ?

Which one of the following group of organisms forms a food chain ?

Grass, human and fish
Grass, goat and human
Tree, tree cutter and tiger
Goat, cow and human
This question was previously asked in
UPSC NDA-1 – 2018
The group “Grass, goat and human” forms a food chain.
A food chain represents the flow of energy in an ecosystem. It typically starts with producers (organisms that make their own food, like plants – grass), followed by primary consumers (herbivores that eat producers – goat), and then secondary or tertiary consumers (carnivores or omnivores that eat other consumers – human eating goat). The chain shows a linear sequence of who eats whom.
Option A is incorrect because fish do not typically eat humans in an ecological food chain context. Option C is incorrect because “tree cutter” is not a consumer in the ecological sense of energy transfer; tigers also don’t typically consume tree cutters as a primary food source. Option D lists multiple primary consumers and one omnivore but doesn’t form a single, sequential food chain; it rather describes organisms at different trophic levels or parallel food paths (goat eats grass, cow eats grass, human might eat goat or cow).