In "Nothing Gold Can Stay," why does Robert Frost allude to Eden
 A.Eden is a place that remained perfect forever, just like the world described in Frost's poem.
 B.Eden is a place that, like the natural world, is known to be filled with gold.
 C.Eden's short-lived perfection is similar to the temporary perfection of nature's first green.
 D.Eden is a place that Frost visited many times and came to think of as golden.