**Core Concept**
Ovulation is a critical phase in the menstrual cycle where a mature ovum is released from the ovarian follicle, making it available for fertilization. This process is regulated by a complex interplay of hormones, including estrogen and progesterone, which stimulate the growth and maturation of the follicle.

**Why the Correct Answer is Right**
Ovulation occurs approximately 14 days before the onset of menstruation, when the levels of estrogen and luteinizing hormone (LH) surge. This surge triggers the release of the ovum from the follicle, which then travels through the fallopian tube, where it can be fertilized by sperm. The LH surge is mediated by the hypothalamic-pituitary-gonadal axis, which is essential for the regulation of the menstrual cycle.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because ovulation is not solely dependent on the menstrual cycle's duration. While the average menstrual cycle length is 28 days, ovulation can occur at any time within the cycle, regardless of its length.
**Option B:** This option is incorrect because ovulation is not a process that occurs in the uterus. Instead, it takes place in the ovaries, where the mature ovum is released from the follicle.
**Option C:** This option is incorrect because ovulation is not a continuous process. It is a single event that occurs when the LH surge triggers the release of the ovum from the follicle.

**Clinical Pearl / High-Yield Fact**
It is essential to note that ovulation can be influenced by various factors, including hormonal imbalances, polycystic ovary syndrome (PCOS), and other endocrine disorders. A thorough understanding of the menstrual cycle and ovulation is crucial for diagnosing and managing related reproductive health issues.

**Correct Answer:** C.