“一桌子苹果，别人通常挑一两个，挑三四个。毕加索最可气，每个都咬上一口。每个苹果上都有他的牙印儿。”一位中国画家如此评价毕加索。毕加索一生搞过素描、油画、雕塑、版画，担任过舞台设计，还写过小说、剧本和无标点散文诗。
从这段文字中我们可以推论（）。

A. The doctor is not at the office.
B. The doctor doesn't want to see him.
C. The doctor is busy writing an appointment book.
D. The doctor has been fully engaged.