The noun clause in the given sentence is an indirect object.
Explanation:
A noun clause is a dependent clause that acts as a noun and can fulfill the function of a subject, direct and indirect object, object of a preposition, or predicate nominative. Noun clauses begin with words such as how, that, what, whatever, when, where, whether, which, whichever, who, whoever, whom, whomever, and why. In the given sentence, a noun clause is whomever wins the Spirit Award.
An indirect object usually refers to someone or something that is affected by the action of a transitive verb, most commonly as a recipient. Whomever wins the Spirit Award is an indirect object of the sentence and represents the recipient (someone who will receive a scholarship).
The subject of the sentence is the league. As there is no preposition in the sentence, the given noun phrase can't be an object of a preposition. The predicate nominative is a noun that follows a linking verb and renames or describes the subject. Nothing like that is encountered in the sentence either. So, the correct option is indirect object.
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