They are called "sources"
Answer:
I think the answer would be B or the second choice you put because it sounds fluent and the second best option would be 4 but I dont think its 4 because there are some words in it that are simply unnecessary.
Explanation:
if you want to find out, divide the price over quantity
4.40/20=.22
3.68/16=.23
the lower price per ounce is .22
Answer is 20ounces for 4.40
20/4.40=