The main idea is the "key concept" being expressed. Details, major and minor, support the main idea by telling how, what, when, where, why, how much, or how many. Locating the topic, main idea, and supporting details helps you understand the point(s) the writer is attempting to express.
The answer is b because I said so
The answer is B. During all "Exhalation" it is shown the importance of the scientific method and how much it affects in the truth.