Which word is incorrect in this sentence: The car that she had seen at the Ford dealer was the one that she final decided to buy?

In the context of the sentence, "final" is incorrect because it should be "finally." The word "finally" serves as an adverb, which means it modifies the verb "decided" and provides clarity to the timing of the decision. It indicates that the decision to buy the car came at the end of a process or after some consideration. The use of "final," an adjective, does not fit grammatically in this context, as it does not appropriately describe an action. Hence, replacing "final" with "finally" corrects the sentence, making it clear that this was the ultimate decision she made regarding her car purchase.