Dorothy Payne, the oldest criminal in Haas Street, is 86 years old and is known as the grandmother jewel thief. The headdress technique with climaxes even has a director filming a documentary for it. She said, "As long as I want it, there is nothing I can't get." I still can't bear to let it go. Let's look at two logical reasoning questions about jewelry theft.

In a jewelry theft case in a shopping mall, the police have found out that the perpetrator must be one of the four ABCD people: during the trial, their confessions are as follows:

A said: I was in the country the day the jewels were stolen, so I couldn't steal from the mall.

B said: D is a criminal.

C said: B is a criminal. I have seen him sell jewelry.

D said: B had a grudge against me, so he set me up.

It was verified that only one of the four people was telling the truth. Can you find out who is the criminal?

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Answer: D is telling the truth and A is a criminal.