Molly Is Sexually Active and Has Had More Than One

Molly is sexually active and has had more than one sexual partner. She protects herself from pregnancy by using the contraceptive patch and from STIs by requiring that her partner wear a condom. Molly has never had any signs or symptoms of an STI. If Molly were to acquire an STI,

A) a course of antibiotics would cover any STI she would be most likely to contract.
B) she would know immediately because of the symptoms.
C) she should avoid all sexual activity until treatment is complete.
D) she would need to tell only her last sex partner about the infection.