In Mozart's "Die Entführung aus dem Serail" (The Abduction from the Seraglio), particularly in the aria "O Isis und Osiris," the equality and dignity of the priest are represented through various musical elements.
To answer your question correctly, consider the following points regarding the choices you provided:
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A minor key: This key can convey a sense of seriousness or gravity, which can align with themes of equality and reverence.
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Fast tempo: A fast tempo might not directly suggest equality but can provide a vibrant and lively character to the music.
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Homophonic texture: This texture often allows for clearer expression of text and can emphasize the words of the aria, thus reinforcing the message of equality.
Given these points, the most comprehensive answer is All the above, as each element contributes to the overall representation of the theme in the aria.