Correct Answer:
Option A - To leave no stone unturned – To try one's (अपना सर्वोत्तम प्रयास करना) utmost or to do everything possible to find something or to solve a problem.
Hence, option (a) is correct.
A. To leave no stone unturned – To try one's (अपना सर्वोत्तम प्रयास करना) utmost or to do everything possible to find something or to solve a problem.
Hence, option (a) is correct.