PT 4, Section 1, ?21, Cloth Diaper vs. Disposable Diapers

[cafe au lait]

Hi All,

I was wondering what makes B correct over D.

D states that Maria demonstrates, which is why I picked D. In Maria's argument she states the 3 reasons why cloth diapers are no bueno. So isnt this in effect demonstrating? I would think that these 3 reasons are cumulatively more serious than filling up landfills.

Thanks