Given the question: Write a multi-choice question for the following article, with the given choices and answer: Article: Mary is four years old. She likes to ask questions. Her questions are often funny. One day Mary goes to see her uncle with her father. Her uncle lives in _ city. The city isn't near their city, so they take a bus to go there. After many hours, they get to Mary's uncle's city. He is very happy to see them. The next morning, Mary's uncle takes her and her father out and shows them around . "Look at that big house," says her uncle. " It's the oldest house in the city." "How old is it?" her father asks. "It is about 2100 years old," her uncle answers."How can that be?" Mary says. "It's only 2015 this year!" ,. Options: A By taxi. B On foot. C By train. D By bus. Answer: D By bus. Question:
The answer is:
How do Mary and her father go to the city?