I don't understand. What is the premise for this sentence? What are you looking for?
Personification , as they ‘ fly ‘
Im guessing its B, Because it just makes more sense! I went in there and read it aloud using both words (A and B) B made more sense. With an object being measured, such as a lemon, to make a quart of lemon juice, Id say you'd use the word number. Amount is not a word used for an object or measurement.
What is tour question because I can't see it?