The correct answer is C. (9) Sadly, even after that water is found, only some of its clean and safe enough to drink.
Step-by-step explanation:
The use of the apostrophe (') in English is common in two situations, the first situation in which the apostrophe is used is to indicate possession of some agent over some object or idea and the second case in which apostrophe can be found is to shows some letters have been omitted when words are contracted. The contraction of words consist of shortening a word or combining two words into one, this usually implies some letters are being omitted and instead the apostrophe is placed to show this omission.
Additionally, in some cases, the use of contractions changes the meaning of words as in the case of the word "it's" that means "it is" and the word "its" which describes possession. This is the case of sentence 9 "Sadly, even after that water is found, only some of its clean and safe enough to drink" in which the word its needs an apostrophe "it's" as in this case the word does not express possession but refers to the state of the water and without this apostrophe the sentence is grammatically incorrect. Thus, the sentence that needs an apostrophe to be correct is sentence 9 "Sadly, even after that water is found, only some of its clean and safe enough to drink".