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Oral contraceptives are generally a formulation of synthetic progesterone and estrogen. Figure 1 shows a typical human menstrual cycle and the corresponding concentrations of steroid hormones during each phase of that cycle.

Figure 1. Figure showing the progression of the menstrual cycle and the different hormones contributing to it. Ovarian and uterine phases are temporally aligned with each other and the hormone profiles below. FSH = follicle-stimulating hormone, LH = luteinizing hormone. “Menstrual Cycle.” Wikipedia: The Free Encyclopedia. Wikimedia Foundation, Inc., 4 Oct. 2016. Web. 6 Oct. 2016. http://en.wikipedia.org/wiki/Menstrual_cycle

Given the information in Figure 1, artificially elevating progesterone with oral contraceptives will prevent pregnancy via which mechanism?

A

Cause uterine contractions and menstruation.

B

Prevent ovulation by not allowing the LH surge to occur.

C

Negative feedback will result in decreased FSH levels, thus preventing ovulation.

D

The elevated progesterone will cause an LH surge.

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