1. The problem is to simplify the radical expression, but the exact radical is not provided in the question. 2. To simplify a radical, we look for perfect square factors inside the radical and take their square roots outside. 3. Since the options given are 4, 2, 2, and 2, it suggests the simplified radical equals 2 or 4. 4. Without the original radical expression, we cannot determine the exact simplification. 5. Please provide the radical expression to simplify it correctly.