Many environmentalists have urged environmental awareness on consumers, saying that if we accept moral responsibility for our effects on the environment, then products that directly or indirectly harm the environment ought to be avoided. Unfortunately it is usually impossible for consumers to assess the environmental impact of a product, and thus impossible for them to consciously restrict their purchases to environmentally benign products. Because of this impossibility there can be no moral duty to choose products in the way these environmentalists urge, since __________________·
Which one of the following principles provides the most appropriate completion for the argument?
(A) a moral duty to perform an action is never based solely on the effects the action will have on other people
(B) a person cannot possibly have a moral duty to do what he or she is unable to do
(C) moral considerations should not be the sole determinants of what products are made available to consumers
(D) the morally right action is always the one whose effects produce the least total harm
(E) where a moral duty exists, it supersedes any legal duty and any other kind of duty
Fill in the blanks questions are generally of two types. It is asking you to either assume a missing information so that the passage can be completed or conclude the passage based on the given information.
In this passage it is asking us to assume and based on that assumption we need to conclude that "Because of this impossibility there can be no moral duty to choose products in the way these environmentalists urge".
The correct answer here is "b" because if the consumer doesn't know anything about the impact of the product that he is buying on the environment how can he be morally dutiful for the impacts that the product might have.
Rest other options do not fit in the blank.