Match the types of niche in column I with their description in column II.

	Colum I		Column II
i	Habitat niche	a.	in the absence of competition in the habitat
ii.	Trophic niche	b.	position of organism in the environmental gradient
iii.	Multidimensional niche	c.	physical space occupied by an organism
iv.	Fundamental niche	d.	level of organism in the food chain.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.