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D is corrent. Every sale of goods by a merchant seller carries with it a warranty of merchantability, unless specifically disclaimed by the merchant. The merchant seller is guaranteeing the goods are fit for the ordinary purpose for which goods of this type are used. The warranty of fitness for a particular purpose is created when the seller (both merchant and nonmerchant sellers) knows of the particular use for which the goods are required and further knows that the buyer is relying on the skill and judgment of the seller to select and furnish suitable goods for this particular use.
A is incorrect. Every sale of goods by a merchant seller carries with it a warranty of merchantability, unless specifically disclaimed by the merchant. The merchant seller is guaranteeing the goods are fit for the ordinary purpose for which goods of this type are used. The warranty of fitness for a particular purpose is created when the seller (both merchant and nonmerchant sellers) knows of the particular use for which the goods are required and further knows that the buyer is relying on the skill and judgment of the seller to select and furnish suitable goods for this particular use. 
B is incorrect. Every sale of goods by a merchant seller carries with it a warranty of merchantability, unless specifically disclaimed by the merchant. The merchant seller is guaranteeing the goods are fit for the ordinary purpose for which goods of this type are used. The warranty of fitness for a particular purpose is created when the seller (both merchant and nonmerchant sellers) knows of the particular use for which the goods are required and further knows that the buyer is relying on the skill and judgment of the seller to select and furnish suitable goods for this particular use. 
C is incorrect. Every sale of goods by a merchant seller carries with it a warranty of merchantability, unless specifically disclaimed by the merchant. The merchant seller is guaranteeing the goods are fit for the ordinary purpose for which goods of this type are used. The warranty of fitness for a particular purpose is created when the seller (both merchant and nonmerchant sellers) knows of the particular use for which the goods are required and further knows that the buyer is relying on the skill and judgment of the seller to select and furnish suitable goods for this particular use.