**Core Concept**
The glucose transporter in myocytes (muscle cells) stimulated by insulin is a key regulatory mechanism for glucose uptake, allowing the cell to take up glucose from the blood and utilize it for energy production.

**Why the Correct Answer is Right**
The correct glucose transporter in myocytes stimulated by insulin is GLUT4. Insulin binding to its receptor on the surface of the myocyte triggers a signaling cascade that ultimately leads to the translocation of GLUT4 from intracellular vesicles to the plasma membrane. This increases the number of glucose transporters available for glucose uptake, allowing the myocyte to take up glucose from the blood. GLUT4 is a type of facilitative glucose transporter that is specifically expressed in muscle and fat cells.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify a glucose transporter.
**Option B:** This option is incorrect because it is not a specific glucose transporter.
**Option C:** This option is incorrect because it is not the correct glucose transporter that is stimulated by insulin in myocytes.

**Clinical Pearl / High-Yield Fact**
Insulin resistance, which can lead to type 2 diabetes, is often associated with impaired glucose uptake in muscle cells due to decreased expression or function of GLUT4.

**Correct Answer:** C. GLUT4.