【单选题】

Mr. Jones had a few days’ holiday, so he said, "I’m going to the mountains by train." He put on his best clothes, took a small bag, went to the station and got into the train. Mr. Jones had a very beautiful hat on. He often put his head out of the window during the trip and looked at the mountains.But the wind pulled his hat off. Mr. Jones quickly took his small bag and threw it out of the window, too.

The other people on the train laughed, "Is your hag going to bring back your beautiful hat " they askeD、
"No," answered Jones. "But there is no name and no address on my hat, and there is my name and address on the bag. Someone is going to find both of them near each other and he is going to send me the bag and the hat.\
The other people laughed because they thought what Mr. Johes did was ______ .A．useful
B．helpful
C．foolish