Which research topic has the narrowest scope? the Civil Rights movement
Martin Luther King's "I Have a Dream" speech
Bob Dylan's choice of words in "The Lonesome Death of Hattie Carroll"
segregation

The way these are phrased, Bob Dylan's word choice would have the narrowest scope. You would be studying parts of a whole song. If you studied the whole song then the scope would be similar to studying MLK's speech. And although the speech could be a broad topic in itself, it is not as broad as the movement of which it was/is a key part.

Explanation:

he will find out what went wrong or happened and how.

you didn't provide the passage.

explanation:

seeing as this is your first question on i can see why you may have not known that you need to provide the passage.

without the passage, or even the name of the passage, we can not read the passage, therefore we can not determine when or how the pacing effects the tone.

however, you can either repost this question (providing the passage this time)

or you can comment below what the passage is, and i'll you to the best of my ability!