The correct answer is A.
The sentence should be written like this: <span>Sadly, even after that water is found, only some of it's clean and safe enough to drink.
Because the sentence is saying "only some of IT IS clean and safe enough to drink," an apostrophe should be used.
</span>
If its based on old or new english changes the qualities
Martin used the phrase " I have a dream" because it was something he wished could happen, maybe in his dreams everyone was living happily together.
