**Core Concept**
Wandering fibroid, also known as a pedunculated submucosal fibroid, is a type of uterine fibroid that grows within the uterine cavity and has a stalk or peduncle that attaches it to the uterine wall. This characteristic allows it to move within the uterine cavity.

**Why the Correct Answer is Right**
The wandering fibroid is able to move within the uterine cavity due to its pedunculated nature, which allows it to be suspended from the uterine wall by a stalk. This is in contrast to other types of fibroids that are more firmly attached to the uterine wall. The peduncle of the wandering fibroid contains smooth muscle and fibrous tissue, which provides the necessary support for its mobility.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specifically address the characteristic of the wandering fibroid that allows it to move within the uterine cavity.
**Option B:** This option is incorrect because it describes a characteristic of intramural fibroids, which are not typically pedunculated or mobile within the uterine cavity.
**Option C:** This option is incorrect because it describes a characteristic of subserosal fibroids, which are typically located on the outer surface of the uterus and do not have a peduncle.

**Clinical Pearl / High-Yield Fact**
The wandering fibroid can cause symptoms such as abnormal uterine bleeding, pelvic pressure, and infertility due to its mobility and ability to interfere with uterine function.

**Correct Answer: C. Wandering fibroids are pedunculated submucosal fibroids that grow within the uterine cavity and have a stalk or peduncle that attaches it to the uterine wall.**