How Can Companies Like Seventh Generation Claim That Their "Green

How can companies like Seventh Generation claim that their "green" products have a lower "real cost" than conventional products?

A) The price of a Seventh Generation product, after special discounts are applied, is usually lower than that of a conventional product.
B) The "real cost" of a product includes not only its production costs, but also its distribution and transportation costs. When these factors are figured into the total, green products turn out to be less expensive.
C) A product's "real cost" includes not only production costs, but also the cost of its total impact on the environment, including disposal or recycling. When these costs are included, green products are less expensive.
D) The "real cost" of a product includes not only its production costs, but also its advertising and marketing costs. When these factors are figured into the total, green products turn out to be less expensive.