Final Answer:
During the menstrual cycle, the cervix produces different types of cervical mucus influenced by hormonal changes. Therefore, the correct answer is option B) Thin and slippery.
Step-by-step explanation:
Thin and slippery cervical mucus is characteristic of the fertile period around ovulation. This type of mucus, often referred to as "egg white" cervical mucus, has a consistency that facilitates the movement of sperm, creating a more hospitable environment for fertilization. The thin and slippery texture is associated with increased estrogen levels, which typically occur just before ovulation.
Recognizing the changes in cervical mucus is an essential aspect of understanding the fertile window in a woman's menstrual cycle. Educating the couple about these changes helps them time intercourse to optimize their chances of conception. The other options, thick and opaque, white and clumpy, and yellow and sticky, do not represent the characteristics of cervical mucus during the fertile period and are not indicative of ovulation.
Therefore, the correct answer is option B) Thin and slippery.