这个题干怎么理解？

littlefishgirl

Brochure:Help conserve our city’s water supply.By converting the landscaping (景观美化) in your yard to a water-conserving landscape, you can greatly reduce your outdoor water use.A water-conserving landscape is natural and attractive, and it also saves you money.



Criticism:For most people with yards, the savings from converting to a water-conserving landscape cannot justify the expense of new landscaping, since typically the conversion would save less than twenty dollars on a homeowner’s yearly water bills.



Which of the following, if true, provides the best basis for a rebuttal(举反例;反驳;抗辩)of the criticism?

不明白题干的意思，是问下面哪个可以作为反对 “criticism”这个人的基础？还是问下面哪个是“criticism”这个人反对上面那个人的基础？