Step-by-step explanation:
Walden has very noticeable strong themes. The importance of self reliance, the Value of Simplicity, the Illusion of progress (Thoreau is very skeptical about considering technological advance as societal advance) and so on. Also, there's the life in the woods itself represented in Walden. So it's hard to see him seeing the new technology as important or beneficial. He was also a logical person, so finding impractical new and better technology is probably not the case. Which leaves us to the the correct answer, the option that fits all of Thoreau's worries.
Answer:
C) He would believe they were destructive to a person’s thinking ability.