In "nothing gold can stay," why does robert frost allude to eden?

a. eden is a place that, like the natural world, is known to be filled with gold.
b. eden's short- lived perfection is similar to the temporary perfection of nature's first green.
c. eden is a place that frost visited many times and came to think of as golden.
d. eden is a place that remained perfect forever, just like the world described in frost's poem.