Step 1: Understanding the Question:
• The question asks for the name of the role of a muscle that balances the action of another, opposing muscle.
Step 2: Detailed Explanation:
• A muscle that balances or steadies the action of another muscle so that the joint stays stable is called a stabilizer.
• As per the NTA final answer key, the accepted option is (C) Stabilizer.
Step 3: Final Answer:
The correct option is (C) Stabilizer.