Answer: B) The poems have different speakers.
Step-by-step explanation: When reading a poem or a text we need to consider that even if it is written in first person (using the pronoun "I") it doesn't mean that the person speaking is the author, it usually is the character that speaks. In the given excerpts, both by Robert Frost, we can see that they have different speakers, by recognizing the different opinions they have about spring. Also the speaker in the first excerpt, doesn't have any animals "But here there are no cows. Before I built a wall I'd ask to know What I was walling in or walling out" and the speaker in the second excerpt has a calf.