单项选择题

Which of the following best describes the organization of the third paragraph of the passage

A. A theory is proposed, considered, and then amended.
B. Opposing views are presented, elaborated, and then reconciled.
C. A problem is described, then a solution is discussed and its effectiveness is affirmed.
D. A view is advanced, then refuted, and an alternative is suggested.
E. A hypothesis is presented, qualified, and then reaffirmed.