## Core Concept
The development of spermatozoa from spermatogonium, also known as spermatogenesis, is a complex process involving multiple stages. It begins with the proliferation and differentiation of spermatogonia, which then undergo several phases of development, including spermatocytogenesis, meiosis, and spermiogenesis.

## Why the Correct Answer is Right
The entire process of spermatogenesis, from spermatogonium to mature spermatozoa, takes approximately 64 days or roughly 2.5 months in humans. This process can be divided into three main phases:
1. **Spermatocytogenesis** (mitotic division of spermatogonia),
2. **Meiosis** (reduction division to form spermatids),
3. **Spermiogenesis** (maturation of spermatids into spermatozoa).
Each phase has a specific duration, and the overall process reflects the time required for these sequential phases to complete.

## Why Each Wrong Option is Incorrect
- **Option A:** This option suggests a much shorter duration than the actual process. Spermatogenesis cannot occur in just a few days due to its complex nature.
- **Option B:** This option might seem plausible but still underestimates the duration required for the completion of spermatogenesis.
- **Option D:** This option overestimates the duration; while it's closer, it exceeds the generally accepted timeframe.

## Clinical Pearl / High-Yield Fact
A key point to remember is that spermatogenesis is a continuous process in the seminiferous tubules of the testes, with different sections of the tubules in various stages of spermatogenesis. This process is crucial for male fertility and is sensitive to disruptions by factors such as heat, certain chemicals, and medical conditions.

**Correct Answer: C. 64 days**