Repeating a sequence of words at the beginning of a phrase is called 'Anaphora' in rhetoric. It is used in speeches to give emphasis to the point being discussed. Thus, the speaker wanted to emphasize his point and encourage his listeners to do something as well.
Answer:
The Mayans <u>had been thriving </u>for many centuries before the arrival of Europeans.
Explanation:
The sentence that says "Rainsford and Zaroff glared at each other," because the verb "glared" contains more imagery than the other examples.