Abstinence is a behavioral method of birth control. Thus the correct option is A.
What is abstinence?
The abstinence is defined as choosing not to engage in a specific behavior or not giving in to a required of intimation or appetite.
Methods which depends on the menstrual cycle can be further divided into fertility awareness methods and natural family Planning (NFP). FAM includes methods that rely on women to monitor physiologic changes during their menstrual cycle whereas natural family Planning relies on the menstrual calendar to differentiate likely fertile from non-fertile days.
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