Correct option is C
The United Nations in its 2015 World Population Prospects report projected that the world population would reach 9.7 billion by the year 2050. This projection highlights significant growth, particularly in regions such as sub-Saharan Africa, while population growth in some other areas, like Europe, is expected to stagnate or decline. The report also emphasized the challenges posed by this growth, including strain on resources, urbanization pressures, and the need for sustainable development.