**Core Concept**
Endocervical polyps are benign growths originating from the endocervical canal, which can cause abnormal uterine bleeding (AUB) due to their potential to interfere with normal endometrial function and hormonal regulation.

**Why the Correct Answer is Right**
The correct answer is **C**. Postmenopausal women are more likely to develop endocervical polyps, which can cause postmenopausal bleeding (PMB). This is because the hormonal environment in postmenopausal women is characterized by low estrogen levels, which can promote the growth of these polyps. The polyps can secrete estrogen, leading to an imbalance in the hormonal environment and causing bleeding.

**Why Each Wrong Option is Incorrect**
**Option A:** Premenopausal women are more likely to have endometrial polyps, not endocervical polyps, which are a different entity.
**Option B:** While endometrial polyps can cause AUB, they are not the most common cause of AUB in postmenopausal women.
**Option D:** Adolescents are less likely to develop endocervical polyps due to the hormonal environment and lower risk of cervical pathology.

**Clinical Pearl / High-Yield Fact**
Endocervical polyps are a common cause of postmenopausal bleeding and should be considered in the differential diagnosis of PMB, especially in women with a history of cervical cancer or cervical dysplasia.

**Correct Answer: C. Postmenopausal women.**