Which lines from "Mending Wall" indicate that the neighbor is willing to participate in mending the wall?
a) We wear our fingers rough with handling them.
b) Oh, just another kind of out-door game, one on a side.
c) There where it is we do not need the wall: To each the boulders that have fallen to each.
d) I let my neighbour know beyond the hill; And on a day we meet to walk the line And set the wall between us once again.