**Core Concept**
The development of the female reproductive system, particularly the uterus and cervix, involves the formation of the Müllerian ducts in early embryonic development. The Müllerian ducts are a pair of embryonic structures that give rise to the fallopian tubes, uterus, cervix, and upper part of the vagina.

**Why the Correct Answer is Right**
The correct answer is related to the embryological development of the female reproductive system. During embryonic development, the Müllerian ducts fuse and differentiate to form the uterus and cervix. This process is influenced by the presence of the anti-Müllerian hormone (AMH), which is secreted by the Sertoli cells of the testes in males. In females, the absence of AMH allows the Müllerian ducts to develop into the female reproductive tract. The uterus and cervix develop from the fusion and differentiation of the Müllerian ducts, specifically from the cranial (upper) part of the ducts.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not accurately describe the embryological origin of the uterus and cervix.
* **Option B:** This option is incorrect because it is associated with the development of the male reproductive system, specifically the formation of the Wolffian ducts.
* **Option C:** This option is incorrect because it is related to the development of the external genitalia, not the internal reproductive organs.

**Clinical Pearl / High-Yield Fact**
The Müllerian ducts are a critical component of female reproductive system development, and abnormalities in their formation can lead to congenital anomalies such as Mayer-Rokitansky-Küster-Hauser (MRKH) syndrome, characterized by the absence or underdevelopment of the vagina, uterus, and cervix.

**Correct Answer: D. Müllerian ducts**