A、The man can’t ride a horse. B、They haven’t got the equipment. C、It’s too expensive. D、They don’t want to catch a bus. C

M: Here we are. Brochures for one day excursions.
W: Mm. A riverboat trip. That looks interesting.
M: Yeah. It does. Where does it go? And how do we get to the river?
W: It says to go by bus to the river. That costs $ 5 per person each way. Then the boat gees along the river for 4 hours. And we can get a meal on the boat.
M: How much does it cost altogether?
W: Well, the boat trip costs $ 20 and the meal is extra if we want it. I suppose it’s a hit expensive -- $ 30 each altogether, and that’s not counting the food and drinks.
M: Yes. It would be relaxing but it is a bit expensive.
W: You’re right. What about horse riding or cycling? Can you ride a horse?
M: Not very well. I’ve only ridden a horse twice in my life. How much does it cost?
W: Let me see. Horse riding is a bit expensive too -- $ 30 for 2 hours. And we’d have to go there by bus. And that would be an extra cost.
M: Er, what about cycling? That shouldn’t be tm expensive. Here we are, err, mountain bikes for hire. $ 30 a day. But $ 20 of that is a deposit and you can get it back when you return the bike. I wonder how far away the cycle hire place is.
W: No. It’s not far at all. I’ll show you...
M: That’s terrific. Cycling looks the best, doesn’t it? That should give us enough exercise. And we can take our own lunch and have a picnic. Now all we have to do is to decide which direction to cycle in.
W: Great. Let’s go. We can talk about that while we’re walking to the hire place.