While in Storage,diaphragms Should Be Coated with

A disadvantage of diaphragms is that A)a high percentage of women are allergic to them. B)they requires the use of a spermicide. C)you must wait to insert them until just before intercourse. D)you must remove them and clean them immediately after intercourse.

Which of the following is a reason that diaphragms have a relatively high failure rate? A)age of users B)incorrect insertion and positioning C)vigorous sexual activity by users D)discomfort of use