Which of the Following Statements About Adolescent Cigarette Use Is

Which of the following statements about adolescent cigarette use is true?

A) The huge increase in the price of cigarettes over the last couple of decades has led to a sharp decrease in the percentage of smoking adolescents.
B) Antismoking campaigns have contributed to the steady decline of cigarette use among adolescents.
C) The most effective way to reduce adolescent smoking has been to enforce laws that restrict sales of cigarettes to minors.
D) Despite changes in tobacco industry policies, the percentage of smoking adolescents has remained stable over the past two decades.