A Client Comes to the Women's Center and Tells the Nurse

A client comes to the women's center and tells the nurse she has had unprotected sex. She asks for emergency contraception. What is the best assessment question for the nurse to ask?

A) "How long ago did you have unprotected sex?"
B) "Did you use a condom?"
C) "What kind of birth control have you used in the past?"
D) "Where are you in your monthly cycle?"