From which literary piece is the line “In Xanadu did Kubla Khan / A stately pleasure dome decree…” taken?

Explanation

The verse “In Xanadu did Kubla Khan / A stately pleasure dome decree…” is from the poem titled 'Kubla Khan'. The other options—'Hellas', 'The Phoenix and the Turtle', and 'The Castaway'—are distinct works that do not contain this line.