If a good is a necessity in nature like; a life saving drug instead of a luxury; like BMW vehicle, then the demand curve as always perfectly inelastic. Option D is correct.
The technical relationship between the price of an item or service and the quantity demanded over a specific time period is represented graphically by the help of demand curve.
The price and quantity demanded are often represented with the price on the left vertical axis and the horizontal axis, respectively.
Therefore a necessity goods make a perfectly inelastic demand curve irrespective of the price fluctuation (increase or decrease) because a customer is willing to subscribe the product whatever it charges by the seller.
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