In which work of Wordsworth does the line "still, sad music of humanity" occur?

Option 1 : Tintern Abbey

The correct answer is Tintern Abbey. 

•  The full title of the poem is "Lines Composed a Few Miles above Tintern Abbey, On Revisiting the Banks of the Wye during a Tour. July 13, 1798".
• It is the concluding poem of the collection that Wordsworth published with his friend Samuel Taylor Coleridge. 
• It was written by Wordsworth after a walking tour with his sister in a particular section of the Welsh Borders.

•  The poem may either be categorized as an ode or as a dramatic monologue. It is written in blank verse with each line having ten syllables.
• After offering a wonderful description of the mesmerizing landscape around him, Wordsworth goes on to expound his theory of pantheism in this poem, ending it with an appeal to the listener to be united with nature around us.