C uses the most positive form of an adverb
Flashbacks are used to recount events that happened before the story's primary sequence of events to fill in crucial backstory.
Answer:
C) One passage provides objective economic data about the river while the other tells the story of two boys adventuring on its water.
Explanation:
The main idea of Mary O'Dell's passage is to present the Mississippi river as an important resource which was used for development of river transport, thus
contributing to the nation's economic growth.
Twain's passage, although also mentioning Mississippi, does so only to give his story a setting, a place for adventures of the two wannabe pirates.
So, the basic contrast between two passages is best described in answer C.
The third one incorrectly uses "our" (first person plural) instead of "their" (third person plural)
