Final answer:
The official currency of the United States is the dollar, which is referred to as 'la moneda' in Spanish.
Step-by-step explanation:
The correct option to complete the sentence is la moneda. The phrase translates to 'The official currency of the United States is the dollar.' In this sentence, 'la moneda' refers to the currency. The peso, like the dollar, is a currency, but it is not the official currency of the United States. The document and the conversion are not relevant to the given sentence.
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