**Core Concept**
The **extrinsic** and **intrinsic muscles of the tongue** play a crucial role in its movement and shape. The **intrinsic muscles**, in particular, are responsible for changing the shape of the tongue.

**Why the Correct Answer is Right**
The correct answer is related to the function of the intrinsic muscles, specifically the **longitudinal**, **transverse**, and **vertical muscles**. However, the muscle that broadens and flattens the tongue is the **longitudinal muscle**, but the question seems incomplete as it doesn't specify the correct answer choice. Generally, the longitudinal muscle helps in shortening and broadening the tongue.

**Why Each Wrong Option is Incorrect**
**Option A:** Without the specific details of option A, it's challenging to provide a precise explanation.
**Option B:** Similarly, option B's details are not provided.
**Option C:** Option C is also unspecified.
**Option D:** Option D's description is missing.

**Clinical Pearl / High-Yield Fact**
Remember that the **hyoglossus** and **genioglossus** muscles are key **extrinsic muscles** of the tongue, but the question focuses on the **intrinsic muscles** that alter the tongue's shape.

**Correct Answer:** D. Transverse muscle of the tongue is not correct as it narrows the tongue, the correct answer would relate to the function of broadening and flattening, which could be associated with the **longitudinal muscle** if the options were provided.