Answer:
The correct answer is A. Alfonso II, Duke of Ferrara.
Step-by-step explanation:
Option B is wrong because Robert Browning is the author, but not the speaker of the poem.
Option C is also wrong because the speaker is her husband describing her as an object, in a possesive way.
Option D is also wrong because Fra'Pandolf is referred by the speaker as the painter who painted the Duchess' portrait.
The correct answer is A. Alfono II, Duke of Ferrara, because the speaker is describing his late wife, the Duchess, and his dominions to an envoy of the Count of Tyrol. Also, the previous poem is called "Ferrara", indicating that the speaker is probably the Duke of Ferrara