We pick up phones that are ringing, but rarely answer phones that are silent. This is an example of

Approximately what percent of American adolescents who report symptoms of drug use receive any treatment?

A) 10 B) 25 C) 50 D) 70

According to the text, about what percent of young children have at least one imaginary companion?

a. about 10% b. about one-fourth c. about half d. about two-thirds