I think the answer is letter b. multivitamins. As what I have read about supplements it include vitamins and minerals and substances which come from a natural source. And also because of this substances it helps the human body maintain its well-being.
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They include injectables (such as Depo-Provera), oral contraceptive pills, patch, ring and the diaphragm. The least effective<span> methods result in 18 or more pregnancies per 100 women in a year, with typical use. They include male and female condoms, withdrawal, sponge, fertility-awareness-based methods, and spermicide.</span>
The answer is D, embraces challenges.