Question

1. why are authority books usually good sources of information?

they have been written by professional writers.
they have been edited and fact - checked.
they are longer than newspaper articles.
they have been reviewed.

Explanation:

To determine why authority books are good information sources, we analyze each option:

• "They have been written by professional writers": Professional writing doesn't guarantee accuracy (e.g., a professional writer could still include errors).
• "They have been edited and fact - checked": The editing and fact - checking process in authority books ensures that the information is accurate, reliable, and free from major errors, which is a key reason they are good sources.
• "They are longer than newspaper articles": Length has no direct relation to the quality or reliability of the information.
• "They have been reviewed": The term "reviewed" is vague. Editing and fact - checking is a more specific and rigorous process related to ensuring information quality.

Answer:

B. They have been edited and fact - checked.