Excitement: There were only 40 such riders going one way and 40 the other. Twain and the others had never seen one, ever. It was a little like anticipating the broadcast on television of the first American landing on the moon.
Finally after much anticipation, they were told they were going to see one such rider, and they did. It thrilled him to see the pony express rider. They were thrilled.
They knew what they were seeing. It was not bewilderment.
They were thrilled by the event. It was not indifference.
They had no reason to be afraid. He would pass them and be gone in and instant.
Answer: D