**Core Concept**
During pregnancy, the cervix undergoes changes in preparation for labor. In multiparous women, the cervix is more effaced and dilated due to previous pregnancies, which affects the external os. This concept is crucial for understanding the changes in the cervix during pregnancy and labor.

**Why the Correct Answer is Right**
The external os in multiparous women is more likely to be **patent** or **widely open**. This is because previous pregnancies have caused the cervix to be more effaced and dilated, leading to a more open external os. The cervix's ability to efface and dilate is influenced by the hormone **relaxin**, which increases during pregnancy and causes the ligaments and connective tissue in the cervix to relax. This allows the cervix to dilate more easily during labor.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because the external os in multiparous women is not typically **stagnant** or unchanged.
* **Option B:** This option is incorrect because the external os in multiparous women is not typically **narrowed** or **closed**.
* **Option C:** This option is incorrect because the external os in multiparous women is not typically **retracted** or **undilated**.

**Clinical Pearl / High-Yield Fact**
It's essential to note that the external os in multiparous women can be more prone to **cervical lacerations** during labor due to its increased diameter and reduced elasticity. This is a critical consideration for obstetricians and healthcare providers when managing labor and delivery.

**Correct Answer: B. Widely open**