A、He has a large family. B、He recognized Mark. C、He lives alone. D、He had done something wrong. C

Some people do not like anything to be out of place: they are never late for work; they return their books to the library on time; they remember people’s birthday; and they put everything in its place at their homes. Mr. Harper is such a person.
    Mr. Harper works in a bank and lives on his own. His sister’s family lives in the next town. But tie does not see his sister or her family from one year to the next. He sends them Christmas cards and he has never forgotten his nephew -- Mark’s seventeen birthdays.
    Last week, Mr. Harper had quite a surprise. He drove home from the bank at the usual time neither too slowly nor too fast. He parked his car where he always parked it, and he went inside to make his evening meal. Straightaway, there was a knock at the door.
    Mr. Harper opened the door, found a policeman standing on the doorstep. "What have I done wrong?" Mr. Harper asked himself. "Have I driven on the wrong side of file mad? Has there been .some trouble at the bank7 Have I forgotten to pay an important bill?  ....  Hello, Uncle," said the policeman, "My name’s Mark."