Which sentence correctly uses the word "who"?

The sentence "This is the woman who won the award" correctly uses the word "who" to refer to the subject of the verb "won." In this context, "who" is a relative pronoun that introduces a clause providing additional information about "the woman." Since the clause describes the woman as the one performing the action of winning the award, "who" is the appropriate choice.

Using "who" correctly indicates that the woman is the subject of the clause. In contrast, the other sentences misuse the word or structure in a way that does not conform to standard grammatical rules. The sentence construction in the correct choice follows proper syntax and clearly communicates the intended meaning.