Answer:
One day, as two white doves suddenly soared aloft in the blue sky, the poor little bird, who had now become the prince's comrade, gave a pitiful little trill.
Explanation:
A. The next day, as he was carefully cleaning the bird's cage, the walls again creaked and groaned, and the mirrors grew narrower as the windows widened.
<em>-The words in this option suggest that doing good things or helping others did the exact </em><em>opposite</em><em>, only brought </em><em>mischief </em><em>to oneself. So this is incorrect.</em>
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B. His fairy godmother had told him that it was his house; therefore he was interested in looking at everything in it.
<em>-No words in this suggest either, no words suggest the theme that helping others often brings benefits to oneself. So this is incorrect.</em>
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C. One day, as two white doves suddenly soared aloft in the blue sky, the poor little bird, who had now become the prince's comrade, gave a pitiful little trill.
<em>I think this would be correct if the bird was sacrificing his own happiness for the sake of the two doves, because at the end he gave a pitiful trill. But, we don't really know that, so I think it would be wrong but lets just assume that's what its doing so I say this is correct.</em>
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D. He spent so much time gazing into the wonderful mirrors that he had very little use for the books and games that had been placed there for him.
<em>He had been given gifts of books and games, but had no use of them because he was gazing into the mirrors. I don't really see how this has to do with the theme. So. I am going with incorrect.</em>
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<em>If I am wrong please tell me so, option C just makes the most sense.</em>