Which of the following best expresses the function of the first paragraph in relation to the passage as a whole?
A.
To establish the parameters of a following debate about man's role in nature.
B.
To identify problem areas within a school of thought, which are then explored in greater detail.
C.
To discuss secondary issues as an introduction to a more detailed examination of a primary issue.
D.
To provide a historical background for a discussion of modern-day issues of public concern.