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.
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To support the idea that a storm was the worst sight in all of America, the author must present information to support this argument. Therefore, the author must have shown meteorological data that show the intensity of the storm and compare it with other storms. In addition, the author must show the destructive power of the storm, presenting the damage it caused to the American population.