题目选项分析

Paper and plastic grocery bags are a continuing problem for the city, both as litter and in landfills. To discourage their use, the city has proposed a tax on each bag, to be paid by the supermarkets that supply them. Several environmental groups, however, oppose the tax, despite having brought the issue to the council's attention in the first place.

Which of the following, if true, would best explain the environmental groups' opposition to the proposed tax?

【选项】Plastic bags account for 90 percent of the grocery bags that litter the city's streets and take up space in landfills.