Which lines from "Mending Wall" best indicate that the speaker is amused while repairing the wall?
a.We wear our fingers rough with handling them.
Oh, just another kind of out-door game,
b.No one has seen them made or heard them made,
But at spring mending-time we find them there.
c.And he likes having thought of it so well
He says again, "Good fences make good neighbours."
d.We have to use a spell to make them balance:
"Stay where you are until our backs are turned!"