Marcus and Venessa Have Planned a Romantic Evening of Dinner

Marcus and Venessa have planned a romantic evening of dinner and dancing. In preparation for the fact that they will most likely have sex later in the evening, Venessa inserts her diaphragm before leaving the house at seven. After the night of dinner and dancing, she expects to arrive at home with Marcus around midnight. What should Venessa know?

A) Dancing might dislodge the diaphragm.
B) Her spermicide is only good for two hours after she inserts it.
C) The diaphragm should only be inserted just before intercourse.
D) She is using her diaphragm correctly.