问题详情

Many people of agencies disagree to the abstinence-only education NOT because
A．the abstinence education has not been proven effective.
B．the president is an advocate of abstinence-education program.
C．abstinence programs have resulted in few short-term benefits.
D．there was no significant change in the percentage of students sticking no sex after the abstinence education.请帮忙给出正确答案和分析，谢谢！