**Core Concept**
Fibroids, also known as uterine leiomyomas, are benign tumors of the smooth muscle layer of the uterus. They can cause various symptoms, including intermenstrual bleeding (metrorrhagia), depending on their location and size. The most common symptom of fibroids is abnormal uterine bleeding, which can occur due to the compression or distortion of the endometrium.

**Why the Correct Answer is Right**
Intermenstrual bleeding in the context of fibroids is most commonly caused by submucosal fibroids, which are located just beneath the endometrium. These tumors can compress the endometrial glands and vessels, leading to irregular bleeding. Submucosal fibroids are a type of intramural fibroid that projects into the uterine cavity. The distortion of the endometrium and compression of the endometrial vessels by the fibroid lead to irregular bleeding, which can manifest as intermenstrual bleeding.

**Why Each Wrong Option is Incorrect**
**Option A:** Subserosal fibroids are located on the outer surface of the uterus and are less likely to cause intermenstrual bleeding.
**Option B:** Intramural fibroids are located within the muscular wall of the uterus and may cause pressure symptoms or pelvic pain, but are less commonly associated with intermenstrual bleeding.
**Option C:** Pedunculated fibroids are attached to the uterus by a stalk and are more likely to cause symptoms such as pelvic pressure or pain, rather than intermenstrual bleeding.

**Clinical Pearl / High-Yield Fact**
Submucosal fibroids are a common cause of abnormal uterine bleeding, including intermenstrual bleeding, and are often associated with an increased risk of postmenopausal bleeding.

**Correct Answer:** C.