PART A: The best choice that identifies the author's main purpose in the final section "Why is the News Sometimes Controversial" is:
to encourage readers to not accept the information that news outlets provide them and seek answers on their own.
PART B: The detail from the text that best supports the answer to Part A is:
"It is impossible to avoid bias completely, but news writers and news readers can still do a lot to make sure the information they share and read is accurate." (Paragraph 10)
This statement suggests a need for critical thinking and encourages readers to actively seek accurate information, aligning with the purpose of encouraging readers not to simply accept news without scrutiny.