Refer to the given figure showing pyramid of number in a certain habitat. Identify A, B and C.

	A	B	C
1.	Grass	Rabbit	Fox
2.	Phytoplankton	Small fish	Large fish
3.	Tree	Birds	Hawk
4.	Tree	Birds	Parasites

detailed solution

Correct option is C

Number of individuals in a trophic level when represented diagrammatically is referred to as pyramid of numbers. The given number pyramid is urn shaped where the producer number is lower with primary consumer maximum in number and lastly the secondary consumer is lower in count than primary consumer.Such number pyramid is found in tree ecosystem. In the tree ecosystem, the single large tree is able to provide food to several herbivores like birds, squirrels, insects which support few carnivores.