Assuming that the bolded word is winner, the correct answer is object complement.
The word winner refers to the word <em>play - </em>and given that the word play is the direct object of this sentence, then the word <em>winner </em>will be its complement - it will complete it, and answer the question What did the critics declare the play to be?
It cannot be a predicate nominative because it is not preceded by a verb. It cannot be a direct object because that is <em>the play. </em>It cannot be a predicate adjective because it is a noun, not an adjective.
I think it’s C because it makes the most sentence according to the first sentence.
Salutations!
What kind of pronoun is "it"?
It is a personal pronoun. Personal pronouns refers to genders that is clearly stated. It is also used to replace names of genders so that the sentence looks comprehensible. It is often used to point out objects.
Hope I helped (:
Have a great day!