After Teaching a Class on Preventing Pelvic Inflammatory Disease, the Instructor

After teaching a class on preventing pelvic inflammatory disease, the instructor determines that the teaching was successful when the class identifies which of the following as an effective method?

A) Advising sexually active females to use hormonal contraception
B) Encouraging vaginal douching on a weekly basis.
C) Emphasizing the need for infected sexual partners to receive treatment
D) Promoting routine treatment for asymptomatic females as risk