human
Question: George liked flying a plane. Once he bought a small plane and learned how to fly it. He soon became so good that he could make his plane do all kinds of tricks . George had a friend. His name was Peter. One day George said to his friend, " Peter, would you like to have a trip in my plane?" Peter thought, " I've traveled in a big plane several times, but I've never been in a small one, so I'll go." They went up, and George flew around for half an hour and did all kinds of tricks.Peter said in a shaken voice , " Well, George, thank you very much for these two trips in your plane." George was very surprised and asked, " Two trips? " "Yes, my first and my last." Answered Peter. From the passage we know that   _   .

Choices:
A) Peter thanked George for the nice trip
B) Peter thought it was wonderful to have such a trip
C) Peter felt surprised that his friend could fly so well
D) Peter was worried about his safety while George was doing tricks in the sky
gpt
The correct answer is 3: Peter was worried about his safety while George was doing tricks in the sky.