【听力原文】
Charles Schulz brought happiness to millions of people. He was born in 1922 in Minneapolis, Minnesota. His father was a barber who cut men‟s hair. When Charles was five, his teacher told him: “Some day, Charles, you‟re going to be an artist.”But he sometimes had trouble with his school work. In high school, he was poor at sports. He was afraid to ask a girl to go out with him. His high school publication rejected some of his drawings he hoped it would publish. At age seventeen, Charles began studying art. He took a class by mail from a Minnesota art school. This was the only art education he ever had.

【解析】该部分最后一句提到查尔斯·舒尔茨通过邮件的形式在明尼苏达艺术学校上课。 可知D选项正确。