A、One. B、Two. C、Three. D、Four. C

M: How long shall we stay at the Grand Canyon?
W: A day?
M: Well, I think we need a bit mom time. There’s so much m see around there. How about two days?
W: OK. That sounds reasonable.
M: What about Yellowstone? The travel agent suggested four days there.
W: I think that’s tm much. We don’t have enough time. Let’s plan on three.
M: OK. And a clay at Mount Rushmore?
W: Right. I just want m see the stone faces.
M: And how many extra days in Washington? Two? Three?
W: Two. That’ll give us five days there all together.
M: Yes. OK. And that leaves two days for the redwood trees in Sequoia National Park.
W: Maybe me day would be bettor. Then we’d have extra time in San Francisco.
M: Oh, I don’t know. I’d rather stay in Sequoia for an extra day.
W: All right. That’s ok with me.