Answer:
These ideas are too specific to be what the ENTIRE article is about. Instead, those details SUPPORT the central ideas of the text. and conclusion paragraph paragraphs often have a THESIS STATEMENT, which is a main idea sentence that shows what the entire passage is about (similar to your on-demand writings).
True but still look on google to make sure
The answer is "D) A report by the state traffic authority" because a report from the state is unbiased (unopinionated) and is, therefore, more reliable than the other three sources.