A client is admitted for a suspected eating disorder. Which of the following statements would indicate that the client may be suffering from anorexia nervosa

A. "I’ve gained 3 pounds in the last month. "
B. "I eat loads of spinach and yellow vegetables each day. "
C. "I’m a perfectionist, and I work hard to get A’s. "
D. "I binge frequently in the morning and feel fat. "

可以把具有相同属性的一些不同对象归类，称为【 】。