Awoman is 40 years old and a heavy smoker. she has a single sexual partner but has very irregular menstrual cycles. she wants a highly reliable contraceptive. assuming that all of the following methods of birth control are acceptable to her, which of the following would be the best recommendation? a) an ovulation suppressantb) a diaphragm and spermicidec) a spermicidal suppositoryd) the rhythm (calendar) method

The correct option is: b) A diaphragm and spermicide

Explanation:

Diaphragm is a type of birth control method that has been found to be moderately effective. The diaphragm has to be placed six hours before, over the cervix of the uterus with spermicide.

It is a barrier method of birth control, therefore, it does not interfere with the natural menstrual cycle of the female.  

Therefore, for a 40 year old female who is a heavy smoker and has irregular menstrual cycles, a diaphragm with spermicide is the best recommendation.

i think your answer is c. measurement system in which the medication dosage was calculated.