What does the speaker personify in "Mending Wall," and why? darkness, to suggest that it will eat everything up like a hungry person
the stones in the wall, which are shaped like loaves of bread
the hunters' dogs, to show that they can outsmart the rabbits
nature, to suggest that walls aren't natural like the pine trees and stones are

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: