The correct answer to this question is "2. The Vision of Judgment" because this poem, written by Lord Byron, is indeed a satire in Ottava rima that attacks both George III and the poet Robert Southey.
Here's how each option matches (or doesn't match) the provided description:
Dunciad: This is a satirical poem by Alexander Pope, targeting bad writers and critics of his time, but it does not focus on George III or Robert Southey.
The Vision of Judgment: Written by Lord Byron, this poem is a satire in Ottava rima. It was written in response to Robert Southey's poem "A Vision of Judgement," which was a eulogy to George III. Byron's work mocks both George III and Southey, making it the correct answer.
Childe Harold’s Pilgrimage: Another poem by Lord Byron, but it is not a satire and does not focus on George III or Robert Southey. It is a long narrative poem written in Spenserian stanzas.
Alastor: This is a poem by Percy Bysshe Shelley. It does not fit the description of being a satire in Ottava rima attacking George III and Robert Southey.
Therefore, "The Vision of Judgment" by Lord Byron is the correct answer because it matches all aspects of the given description.