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A is corrent because a seller has the right to "cure" nonconforming performance when there is still time left for performance under the contract. To do so a seller must seasonably notify the buyer of his intention to cure, and must tender conforming goods within the original time specified by the contract.
B is incorrect because Nix is not required to accept the nonconforming goods. A buyer may accept the nonconforming goods and recover damages.
C is incorrect because to refuse delivery of conforming goods on June 23 would be considered a breach of contract if the seller has seasonably notified the buyer of his intent to "cure."
D is incorrect because although the seller does have a right to "cure" nonconforming goods, the seller must give notice of this intent to cure.