单选题 Old Reese became angry because ____________.

A、 his son had learned nothing at school
B、 his son was weak at all his lessons
C、 his son couldn't do anything in the companies
D、 his son had sold one of his companies

【正确答案】 D

【答案解析】[解析]从文章第二段第三句：But his father didn't mind it until one day he found the young man had sold one of his companies． He became so angry...得知。故本题答案为D。