Which of the Following Is True About the HPV Vaccine

Which of the following is true about the HPV vaccine?

A) Medical research suggests that the vaccine leads to an increased risk of cervical cancer.
B) Many parents oppose the vaccine because there has not been adequate research to show its safety.
C) The vaccine has been shown to cause significant weight gain in adolescent girls.
D) Many parents object to the vaccine on the unfounded idea that a sex-related vaccine will encourage sexual activity.