Final answer:
The first passage is descriptive and informative about the Mississippi River, while the second passage is discursive and uses the river for plot points. The first passage presents factual information about the river's contributions, while the second passage uses it as a setting for the characters' plans.
Step-by-step explanation:
The structure of the first passage can best be distinguished from the second passage by option B) - The first passage is descriptive, while the second passage is discursive. The first passage provides information about the physical and economic contributions of the Mississippi River, while the second passage presents a fictional account of characters planning a life of crime using the Mississippi River for their activities.
The difference in how the Mississippi River is presented in each passage can be described by option D) - In the first passage, factual information about the Mississippi River is presented, while the second passage simply uses the Mississippi River for plot points and setting. The first passage focuses on the river's role in supplying water and its navigable waterways, while the second passage uses the river as a location for the characters' plans.