Question

something there is that doesnt 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 please 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?

himself
his neighbor
nature and hunters
rabbits and dogs

Explanation:

From the text, "Something there is that doesn't love a wall... " implies nature causes gaps. Also, "The work of hunters is another thing... " shows hunters' actions (disturbing stones while hunting rabbits) also create gaps. So the speaker blames nature and hunters.

Answer:

nature and hunters