According to statistics cited in the text, today in the United States about what percent of children under the age of 18 live in single-parent homes?

Prior to the early twentieth century, high schools were designed:

A. to keep delinquent children out of trouble. B. for elite youngsters. C. to offer vocational instruction. D. to provide general education.

Generalizing from research reported in the text, you would expect that a shy child would be most likely to also be popular if that child were being raised in which of the following countries?

a. China b. the United States c. England d. Canada