The correct option is (C): Ecological efficiency
| LIST I | LIST II | ||
|---|---|---|---|
| A | Pour oil on troubled waters | I | not to commit oneself |
| B | Rule the roast | II | to find fault with |
| C | Sit on the fence | III | to pacify the matters |
| D | Pick holes | IV | To dominate |
Choose the correct answer from the options given below: