**Core Concept**
Spermatogenesis is the process of sperm production in the male reproductive system, involving the transformation of a diploid spermatogonium into a haploid spermatozoon. This process occurs in the seminiferous tubules of the testes and involves a series of cellular transformations.

**Why the Correct Answer is Right**
The correct sequence of spermatogenesis is as follows:
- **Spermatogonium**: A diploid cell that undergoes mitosis to produce another spermatogonium or differentiates into a primary spermatocyte.
- **Primary spermatocyte**: Undergoes meiosis I to produce two secondary spermatocytes.
- **Secondary spermatocyte**: Undergoes meiosis II to produce two spermatids.
- **Spermatid**: Differentiates into a mature spermatozoon through a process called spermiogenesis.

**Why Each Wrong Option is Incorrect**
**Option A:** Spermatid is incorrect because it is a cell that differentiates into a spermatozoon, but it is not the first cell in the sequence.
**Option B:** Spermatocyte is incorrect because it is a cell that arises from the spermatogonium, but it is not the first cell in the sequence.
**Option D:** Spermatozoa is incorrect because it is the mature form of the sperm cell, but it is not the step that precedes the others in the sequence.

**Clinical Pearl / High-Yield Fact**
It is essential to remember the correct sequence of spermatogenesis to understand the development of male gametes and the role of meiosis in the production of viable sperm.

**Correct Answer:** c) Spermatogonium