Based on the excerpt from Robert Frost’s poem “Mending Wall”, the speaker thinks his neighbor is stubborn (option A). Someone is stubborn when they are determinate to nor change their attitude on something when it refers to good arguments or reasons to do so. His neighbor continues on repairing the wall that separates them and says that “Good fences make good neighbors.” In the end, the poem’s teaching is that a wall needs to be preserved between properties. This is to safeguard that the personal identity and individuality of the neighbors, specifically as farmers are preserved.