| LIST I | LIST II |
| A. Involute Gear | I. Variable Pressure Angle |
| B. Cycloidal Gear | II. Constant Pressure Angle |
| C. Gyroscope | III. Sensitivity |
| D. Governor | IV. Stability |
The correct matching is as follows:
Therefore, the correct answer is Option 4: A - II, B - I, C - IV, D - III.
Match List-I with List-II 

