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.
“It is only with the heart that one can see rightly. What is essential is invisible to the eye.” This is pretty much meaning that you need to think correctly to be able to understand most things.
i wish i knew let me know when u find out thxs