Step 1: Identify the author of these works.
John Keats, one of the most famous Romantic poets, wrote *Endymion* and *Hyperion*. These two long poems are among his key works.
Step 2: Analyze each option.
- (A) William Wordsworth: Incorrect. While Wordsworth is a famous Romantic poet, he did not write *Endymion* or *Hyperion*.
- (B) P. B. Shelley: Incorrect. Although Shelley was a contemporary of Keats, he did not write these poems.
- (C) John Keats: Correct. John Keats wrote both *Endymion* and *Hyperion*.
- (D) S. T. Coleridge: Incorrect. Coleridge was a key figure in the Romantic movement but did not write these particular works.
Step 3: Conclusion.
John Keats is the author of *Endymion* and *Hyperion*.