In Order to Keep Her Date Spontaneous and Romantic,Elena Inserts

In order to keep her date spontaneous and romantic,Elena inserts a diaphragm and spermicide before she leaves work at 4 pm.After cocktails,dinner,and dancing,she goes to her date's apartment and begins lovemaking at about midnight.Is this safe in terms of preventing pregnancy?

A) Yes,a diaphragm is effective for 6 to 8 hours after insertion with spermicide.
B) Yes,as long as it is in place,it is an effective sperm barrier.
C) No,the dancing may dislodge the diaphragm from its correct position in the vagina.
D) No,a diaphragm is only effective for up to 6 hours after insertion with spermicide.