The correct answer is C. John Keats.
The line “A thing of beauty is a joy for ever” is from John Keats’s poem “Ode on a Grecian Urn”. The poem is about the beauty of an ancient Greek urn and how it can bring joy to people even though it is from a different time and place.
The other options are incorrect. A. P. B. Shelley was a British Romantic poet who is best known for his poems “Ozymandias” and “The Masque of Anarchy”. William Wordsworth was also a British Romantic poet who is best known for his poems “I Wandered Lonely as a Cloud” and “Tintern Abbey”. Robert Browning was an English poet who is best known for his dramatic monologues, such as “My Last Duchess” and “The Ring and the Book”.