**Core Concept**
Otosclerosis is a type of bone disorder that affects the middle ear, leading to conductive hearing loss. The condition involves abnormal bone growth in the middle ear, causing fixation of the stapes bone and disruption of sound conduction.

**Why the Correct Answer is Right**
The most preferred surgical option for otosclerosis is a stapedotomy, which involves making a small hole in the fixed stapes bone to improve sound conduction. This procedure is preferred over stapedectomy, which involves removing the entire stapes bone, as it preserves the natural bone and reduces the risk of complications.

**Why Each Wrong Option is Incorrect**
* **Option A:** A tympanoplasty is a surgical procedure to repair the eardrum and middle ear bones, but it is not the preferred option for otosclerosis.
* **Option B:** A cochlear implant is a device that bypasses damaged hair cells in the inner ear to directly stimulate the auditory nerve, but it is not an option for treating conductive hearing loss caused by otosclerosis.
* **Option C:** A mastoidectomy is a surgical procedure to remove diseased bone in the mastoid process, but it is not the preferred option for treating otosclerosis.

**Clinical Pearl / High-Yield Fact**
The most common cause of conductive hearing loss in adults is otosclerosis, and the preferred surgical option is a stapedotomy to improve sound conduction.

**Correct Answer:** C.