The question is asking us to say"Which sentence is missing an apostrophe for a contraction?
A. (7) Traditionally it is the job of women and children to spend their days searching for water.- this sentence is grammatically correct
B. (9) Sadly, even after that water is found, only some of its clean and safe enough to drink. - this is the right answer! it should be "it's" since it's a contraction of "it is" - the water is clean
C. (4) For many parts of the world, however, this is not true. - no contraction is necessary here
D. (5) Water is not everywhere it's miles away." - here, the contraction is necessary, but it is already in a proper form!