A、In the car. B、In the newspaper. C、At the bookstore. D、At the police station. B因为Henry正是通过在报纸上登广告，让偷书人知道他想买书，从而使他上钩。

Henry Smith taught science at the City School. Once he went to a bookstore and bought some books, most of which were expensive ones.  He left them in his car in a quiet street. Then he went and bought some other things at other shops. At 6 o’ clock he came back to the car. One window was open - and the books were gone! Henry drove back to his home on Lake Street. That night he wrote a letter to a newspaper. The next day he went to the police. On Friday people read an advertisement in the newspaper:
                        BOOK WANTED
    Have you any books that you no longer want? I buy old and modem books.  Open all day on Saturdays.  Henry Smith, 18 Lake Street.
    Henry stayed at home on Saturday.  His first visitor came at 8 o’ clock. Henry took him to the kitchen. At half past nine, another man arrived.  He had a bag under his arm.
    "Mr. Smith?" the man asked.
    "That’s right," Henry said. "Can I help you?"
    "I have some good books.  You buy books, don’ t you ?"
    "Yes, bring them in. I’ Il have a look at them."
    Soon the books were on the dining - table. "Come in now," Henry called out," and bring the list."
    A policeman came into the dining -room. He read the rifles on the books and then those on the list in his hand. They were the same.
   "Come with me, sir," the policeman said to the man.