The key statement that highlights the differences between the Haiku by Buson and the poem - "To Autumn" by Wiliam Blake is:"Autumn, laden with fruit, and stained With the blood of the grape"
<h3>Why is the sentence the key difference? </h3>
The sentence by Blake references Fruits hence modifying the tone of the poem by communicating harvest and life in contrast to the Haiku which seems to communicate dreariness and gloom.
The word in caps is a predicate adjective complement. The answer to your question is D. I hope that this is the answer that you were looking for and it has helped you.