C. Price-consumption curve helps in deriving the a consumer's demand curve for a commodity.
Explanation:
Price-consumption curve is kind of graphical representation that shows the relation of change in the consumption choice of the consumer, when the price of the goods changes.
The price consumption curve can help in deriving the demand curve of the consumer for a product. The consumption of choice of the goods changes if the cost of the goods changes.
The price consumption curve helps in finding the price effect. A budget line is shifted due to change in the income of the individual or the change in the cost of the product.