SAT Question 60a4c088: Form Structure And Sense answer and explanation

English - Form Structure And Sense - Plural And Possessive Nouns
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What makes the theremin a unique musical instrument? You play it without touching it. When you place your ______ the pitch will shift as your hands move through the air.
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Difficulty:Easy
Which choice completes the text so that it conforms to the conventions of Standard English?