**Core Concept**
The process of spermatogenesis involves the development of spermatozoa from spermatogonia through a series of cellular divisions and transformations. This complex process is tightly regulated by hormones and takes a significant amount of time to complete.

**Why the Correct Answer is Right**
Spermatogenesis occurs in the seminiferous tubules of the testes and involves the transformation of spermatogonia into spermatozoa through a series of mitotic divisions, meiotic divisions, and spermiogenesis. The entire process takes approximately 64-72 days to complete, during which time the spermatogonia undergo numerous cell divisions and transformations to become mature spermatozoa. This prolonged process is essential for the production of high-quality sperm.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately reflect the duration of spermatogenesis.
**Option B:** This option is incorrect because it is a significant underestimation of the time required for spermatogenesis.
**Option C:** This option is incorrect because it is a slight overestimation of the time required for spermatogenesis, but not accurate enough.

**Clinical Pearl / High-Yield Fact**
It is essential to remember that the duration of spermatogenesis is crucial for the production of high-quality sperm. Any disruption to this process can lead to infertility or other reproductive issues.

**Correct Answer:** C. 64-72 days.