Which phrase from John Keats's "To Autumn" contributes to a mood of serene stillness?


A.

"sitting careless on a granary floor, /Thy hair soft-lifted by the winnowing wind"


B.

"Close bosom friend of the maturing sun"


C.

"in a wailful choir the small gnats mourn . . . borne aloft / Or sinking as the light wind lives or dies"


D.

"summer has o'er-brimmed their clammy cells"