The two details from the text that best support the answer to Part A are:
B. "'They thought that MTV was a bunch of coked-up rock and roll fiends, and they were right in a way,' Marks says." (Paragraph 8)
D. "MTV's impact was immense during the 1980s. It made artists like Madonna and Guns N' Roses into stars." (Paragraph 14)
What are the supporting details?
In part A of the question, we are asked what the central claim of the passage is. The central claim of the passage is that MTV's evolution over the decades changed the way people perceived music and television.
Supporting facts include the thought that MTV was a bunch of coked-up rock and roll fiends, and the fact that MTV's impact was immense during the 1980s.