The dialogue that discloses the character of Nina is the word "yes, she has pity on the poor orphan" because she is been controlled.
From the dialogue, it is deduced that the character of Nina carries generosity yet her brother's control over her mars her from taking required actions that she aspires to take in her life.
This validates or establishes the claim that her character is under the control of her brother.
Therefore, the Option C is correct.
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