**Core Concept**
The cervix: corpus ratio is an important anatomical parameter in gynecology, which changes throughout a woman's life, particularly during puberty. The ratio is determined by the relative size of the cervix and the uterine corpus (body). This ratio is crucial for understanding the development and growth of the female reproductive system.

**Why the Correct Answer is Right**
During puberty, the cervix: corpus ratio changes due to the growth and development of the uterus. The uterine corpus grows more rapidly than the cervix, resulting in a decrease in the cervix: corpus ratio. This change is a normal part of puberty and is essential for reproductive function. The decrease in the ratio is due to the increased growth of the endometrium and the myometrium of the uterine corpus.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not accurately reflect the change in the cervix: corpus ratio during puberty. The ratio decreases, not increases.
* **Option B:** This option is incorrect because it does not account for the growth and development of the uterus during puberty.
* **Option C:** This option is incorrect because it does not accurately represent the change in the cervix: corpus ratio during puberty.

**Clinical Pearl / High-Yield Fact**
A normal cervix: corpus ratio is approximately 1:2 to 1:3 in prepubertal girls, which decreases to approximately 1:1 during puberty. This change is a normal part of female reproductive development.

**Correct Answer:** B.