Read the excerpt from "mending wall." something there is that doesn't love a wall, that sends the frozen-ground-swell under it, and spills the upper boulders in the sun; and makes gaps even two can pass abreast. the work of hunters is another thing: i have come after them and made repair where they have left not one stone on a stone, but they would have the rabbit out of hiding, to the yelping dogs. the gaps i mean, no one has seen them made or heard them made, but at spring mending-time we find them there.

whom does the speaker blame for the gaps in the wall?

a. himself
b. his neighbor
c. nature and hunters
d. rabbits and dogs