The answer is correct; "amount" in that sentence refers to money. "quantity" is not the appropriate word.
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Masanori TakaokaThe answer is "3", but why not "1"?We prefer to use quantity / number in connection with countable nouns, and amount for non-count nouns.
AlpheccaStarsWe prefer to use quantity / number in connection with countable nouns,I wouldn't use quantity with a countable noun, but a large/great quantity of snow sounds good to my ear.