Environmental impact statements (EIS) must:

a. be written by all developers.

b. contain alternate courses of action.

c. discuss the economic impact of the proposed action.

d. be written only when there is an air pollution concern.

Environmental impact statements (EIS) must contain alternate courses of action.

Answer: Option B

Explanation:

Environmental impact statements are the statements or the document which is prepared to describe the effects that a particular action that has been proposed will have on the environment. How will that action impact the environment whether in a positive or in the negative way is given in this document.

Here the world environment has been defined as the natural and the physical environment and how and what relation the people have with the environment. It also gives alternative course of action to change the actions in a way which is better for the environment.