The answer is C: "And for all this, nature is never spent; There lives the dearest freshness..."
Gerard Manley wrote the poem "God's Grandeur", in which he mentions God's splendor everywhere, and he wonders why people fail to pay attention. But he is encouraged with the knowledge that God's spirit lovingly cares for an imperfect world, which makes him to express his faith: The presence of the "dearest freshness" (God's) makes nature ever alive.