Why do natural methods of contraception have high failure rates?

A. There are only a few days in a month when a couple can have sex without the risk of pregnancy.
B. It completely stops ovulation and disrupts a woman's menstrual cycle.
C. These methods increase the chances of contracting an STI.
D. Determining the time of ovulation is a complicated process which depends on many factors.
E. The frequency of ovulation is increases and this leads to higher chances of conception.


Answer: D

Interdisciplinary Studies

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