Which image from john keats's "to autumn" best captures the bountiful nature of the season?
a. "sometimes whoever seeks abroad may find / thee sitting careless on a granary floor"
b. "where are the songs of spring? ay, where are they? / think not of them, thou hast thy music too"
c. "the red-breast whistles from a garden-croft; / and gathering swallows twitter in the sky"
d. "to bend with apples the moss'd cottage-trees, / and fill all fruit with ripeness to the core"