The passage primarily suggests that:. (A) although the speaker loves the river, he must leave it in order to challenge himself
(B) as the speaker becomes obsessed with the river, he increasingly fears and mistrusts it
(C) as the speaker becomes more familiar with the river, his attitude toward it becomes more practical
(D) when the speaker reflects on the past, he finds himself growing nostalgic
(E) because the speaker is eager to improve his navigational skills, he is willing to abandon other pleasures

(C) as the speaker becomes more familiar with the river, his attitude toward it becomes more practical.

Explanation: The passage suggests the chemistry forged when one continously indulge in a certain action. According to an excerpt from the passage, the speaker said in quote "Now that I had master the language of this water and had come to know every trifling feature that bordered the great river as familiarly as I knew the letters of the alphabet". This emphasizes that the familiarity formed as a result of long and continued association makes them have a practical relationship.

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thinking about things and referring to books instead of acting on superstition and gossip.