CR的一个问题，谢谢大家帮忙解答一下

GWD3-Q17:

Brochure:  Helpconserve our city’s water supply.  Byconverting the landscaping in your yard to a water-conserving landscape, youcan greatly reduce your outdoor water use. A water-conserving landscape is natural and attractive, and it alsosaves you money.

Criticism:  For mostpeople with yards, the savings from converting to a water-conserving landscapecannot justify the expense of new landscaping, since typically the conversionwould save less than twenty dollars on a homeowner’s yearly water bills.

Which of the following, if true, provides the best basisfor a rebuttal of the criticism?

A.   Evenhomeowners whose yards do not have water-conserving landscapes can conservewater by installing water-saving devices in their homes.

B.    Aconventional landscape generally requires a much greater expenditure onfertilizer and herbicide than does a water-conserving landscape.

C.   Asignificant proportion of the residents of the city live in buildings that donot have yards.

D.   Itcosts no more to put in water-conserving landscaping than it does to put inconventional landscaping.

E.    Somehomeowners use more water to maintain their yards than they use for all other purposescombined.