Final answer:
The correct answer is C, projecting that 75% of the global population will live in urban areas by 2050, in line with the United Nations forecast of 68% by that year.
Step-by-step explanation:
According to the United Nations, 68% of the world population is projected to live in urban areas by the year 2050. This represents a considerable increase from the current figure, which stands at 55% globally, with diverse urbanization rates across different regions ranging from highly urbanized areas like North America to less urbanized regions such as Africa.
Hence, the correct answer that identifies the projected percentage of people living in urban areas in the next 50 years is Option C: 75% of the global population, taking into account the anticipated increase and the current trend towards urbanization.