Insert the appropriate word in the given sentence :

He succeeded ________ dint of perseverence and sheer hard work.

by

The correct word to fill in the blank is Option 2: by.

The phrase "by dint of" means "because of" or "through the force of". It is used to emphasize the effort and determination that someone has put into something. In this context, "by dint of perseverance and sheer hard work" means that the person succeeded because they were persistent and hardworking.