Respuesta :
Answer:
The Great Wall is over 13,000 miles long.
Explanation:
This keeps the tone consistent in explaining the detail of how/what the wall is made (of)
first option goes with author opinion which is not necessary and ruins tone
Second option yet again goes to author's opinion which would ruin tone
Third option is just not scientifically correct and has absolutely nothing to do with how the wall is built.
So that leaves the last option which is the most logical and won't ruin the tone. It strictly adds the fact on how long the wall is with no opinion. Just like with the paragraph!
(Have a great day!)
The sentence would maintain a consistent tone if added to the paragraph is The Great Wall is over 13,000 miles long.
What is consistent tone?
Consistent tone serves as one that is used by author to familiarize his work with his audience, it involves using almost same tone.
Therefore, from the paragraph, which was describing the Great Wall of China can still discuss about the size in a constitent manner.
Learn more about consistent tone at;
https://brainly.com/question/26994632