A、No one. B、One young man. C、His son. D、Mathew. A细节辨认题。短文第一段第三句指出The hairdresser worked alone可知这个老理发师自己独自工作。故选项A正确。

Mathew lived in a big city, and always had his hair cut by the same hairdresser. Mathew went to him once a month. The hairdresser worked alone, but he always cut Mathew’s hair exactly as Mathew liked it, and while he was doing it, the two men would talk about their favorite games or movies. But one day the old hairdresser said to him, "Mathew, I’m going to be sixty-five years old next month, so I’m going to retire. I’m going to sell my shop to a young man who wants to be a hairdresser." Mathew was very sad to hear this, because he enjoyed talking to the old man, and he was also worried that his hair would not be cut as well by the new gentleman.
    He went to the shop again next month, and the new man was there. He did a very bad job when he cut Mathew’ s hair. Next month, Mathew went into the shop again. The young man asked him how he would like his hair cut, and Mathew answered, "Please cut it very short on the right side, but leave it as it is on the left. It must cover my ear. On top, cut all the hair away in the middle, but leave a piece at the front which can hang down to my chin." The young man was very surprised when he heard this. "But sir," he said, "I can’t cut your hair like that!"?"Why not?" Mathew asked. "That’ s how you cut it last time."
Questions 22 to 25 are based on the passage you have just heard.
22. How often did Mathew go to the old hairdresser?
23. Whom did the old hairdresser work with?
24. Why was the old hairdresser going to sell his shop?
25. How did the new hairdresser cut Mathew’ s hair?