**Core Concept**
The umbilical cord is a vital structure connecting the fetus to the placenta, facilitating the exchange of oxygen, nutrients, and waste products. It is composed of two umbilical arteries and one umbilical vein, surrounded by Wharton's jelly, a gelatinous substance that provides cushioning and support.

**Why the Correct Answer is Right**
The correct answer is related to the structure and function of the umbilical cord. The umbilical arteries carry deoxygenated blood from the fetus to the placenta, where it is oxygenated and nutrient-rich. In contrast, the umbilical vein carries oxygenated blood from the placenta to the fetus. The two umbilical arteries are responsible for removing waste products, including carbon dioxide, from the fetus. The correct answer is likely related to the function of one of these arteries or the vein.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not accurately describe the function of the umbilical cord.
* **Option B:** This option is incorrect because it is not a well-known fact about the umbilical cord.
* **Option C:** This option is incorrect because it contradicts the established understanding of the umbilical cord's structure and function.
* **Option D:** This option is incorrect because it is not a characteristic of the umbilical cord.

**Clinical Pearl / High-Yield Fact**
It is essential to remember that the umbilical cord contains two umbilical arteries, which are responsible for removing waste products from the fetus, and one umbilical vein, which carries oxygenated blood to the fetus. This knowledge is crucial in understanding fetal development and potential complications during pregnancy.

**Correct Answer: C. The umbilical cord contains two umbilical arteries and one umbilical vein.**