The sentence from Passage 2 that is related to the idea of organic trash accounting for a lot of the weight and bulk of trash is:
A. “A container of milk here, a bag of cookies there, and a box of raisins—it all adds up to pounds upon pounds of food being thrown away in schools each week.” (paragraph 6)
This sentence discusses food being thrown away, which directly relates to the concept of organic trash mentioned in Passage 1.