Which one of the following best describes the organization of the passage? A. A hypothesis is introduced and studies relevant to the hypothesis are discussed and evaluated. B. A natural phenomenon is presented and several explanations for the phenomenon are examined in detail. C. Behavior is described, possible underlying causes for the behavior are reported, and the likelihood of each cause is assessed. D. A scientific conundrum is explained and the history of the issue is recounted. E. A scientific theory is outlined and opinions for and against its validity as well as experiments supporting each side are compared.