<span>The answer is option B
Nowadays, water scarcity is a problem for 1.2 billion people, almost one fifth of the world's population (7 billion). According to reports from United Nations Development Programme, in 2025,
this problem will reach 1.8 billion suffering total water scarcity, and two-thirds of the world's population might be living under water-stressed conditions.</span>
A) the same as Atticus
Hope that helps :)
B, Redundancy<span> is the grammatical error in the title. Using the words 'relationship between' and 'correlation' is redundant/unnecessarily repetitive. (Correlation is a mutual relationship or connection between two or more things).</span>
D. Good for doing research.