Answer:
D: take flight
Step-by-step explanation:
"The Wild Swans at Coole" set in Coole Park Ireland is William Buttler Yeats' (1865–1939) lyrical poem written before the end of the World War I (1916-17) and during Irish struggle for freedom from the Britain.
The speaker/poet in the start of the poem says that nineteen years ago when he visited the same park, all the swans suddenly flew away before he could finish counting them.
"I saw, before I had well finished,
All suddenly mount
And scatter wheeling in great broken rings
Upon their clamorous wings"
However near the end of the poem he says that now, the swan did not fly, but just keep drifting on the still water,
"But now they drift on the still water,
Mysterious, beautiful;"