In “Gathering Leaves,” Frost describes the unending task of gathering fall leaves and ending up with bags of leaves that serve no purpose. Which lines from the poem best convey this thought?

“An since they grew duller / From contact with earth, / Next to nothing for color.”

“Spades take up leaves / No better than spoons, / And bags full of leaves”

“But the mountains I raise / Elude my embrace, / Flowing over my arms”

“Again and again / Till I fill the whole shed, / And what have I then?”