题目选项分析

Disposable diapers, while a convenience, are an environmental disaster. If people would use cloth diapers instead of those made of disposable paper, much less paper would be produced saving millions of trees each year. Therefore, people should go back to buying, washing and reusing cloth diapers and Earth`s precious natural resources would not be consumed so rapidly.

This argument depends of which of the following assumptions?

【选项】The annual cost to the consumer of using cloth diapers is only 20% the annual cost of using disposable diapers.