Why Is Case Law So Important in Setting Environmental Policy

Why is case law so important in setting environmental policy?

A) Fear of being criminally prosecuted will keep potential violators of environmental laws from violating the laws.
B) The formal documents and laws enacted by the legislature are the laws that determine the details of environmental policy.
C) Federal agency rule-making and standard-setting is not influenced by politics and therefore has a strong influence on environmental policy.
D) The courts are expected to hammer out the details of environmental laws that pass.
E) Case law is no more important than any other type of law in setting environmental policy.