Our school had decided to take us to the Himalayas for excursion. I __ to convince my mother to give consent
Select the most appropriate option to fill in the blank.
In this context, the speaker is trying to convince their mother to give consent for the excursion to the Himalayas. "Left no stones unturned" means to make every possible effort or to try everything available to achieve a goal, which aligns with the speaker's attempt to persuade their mother. The other options don't quite fit the context as well.