The correct answer is: C. (A) is correct but (R) is incorrect.
Assertion (A) is correct. The demand for a commodity refers to the quantity of the commodity that consumers are willing and able to purchase at a certain price during any particular period.
Reason (R) is incorrect. The contraction of demand is the result of a decrease in the price of the good concerned. When the price of a good decreases, consumers are willing and able to purchase more of the good. This is known as the law of demand.
Here is a diagram that illustrates the law of demand:
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