Select the option that converts the given sentence into the superlative degree.
The river Ganga has some of the purer water on earth.
1
The river Ganga has some of the most purest water on earth.
2
The river Ganga has some of the very purest water on earth.
3
The river Ganga has some of the more purest water on earth.
4
The river Ganga has some of the purest water on earth.