Blum and Colleagues Surveyed More Than 10,000 Adolescents (Grades 7

Blum and colleagues surveyed more than 10,000 adolescents (Grades 7 through 12) . The researchers found all of the following, except

A) 9% of youth used a weapon in the past year.
B) 1 in 5 students in 7^th and 8^th grade had already experienced sexual relations.
C) tendencies to engage in risky behaviors increased if youth experienced school failure.
D) 25% had smoked cigarettes in the past month.