Answer:
An expert's opinion provides historical background of an important concept.
Explanation:
The text presented in the question above, presents us information about the labor practices used in the fast food industry adopted in the beginning of the 20th century. To give veracity and relevance to this information, the text presents the report and opinions of Alfred D. Chancler, a business historian. The presence of an expert like Alfred, makes the text more versatile and specific, since we know that an expert will provide true information about these labor practices. Thus, we can state that the text presents evidence developed by an expert, who provides real historical concepts to confirm that the information contained in the text is true.
Explanation:
A witness would be someone that has experienced something at first hand, having saw something from a different perspective. An ally is someone who is acquainted with you, or someone you could trust. A witness cannot be an ally if you are against their side in some form or way. A witness can be an ally if it is your best friend or someone you trust to prove you innocent.
Basically, a witness is a neutral term that describes someone that saw something. While an ally refers to mutually acceptable.
I haven't read the book in two yes but I think it's B
Answer: A would be the correct answer
Explanation: