The correct answer is - 725 million.
The actual projection for the population of Latin America and the Caribbean regions for the year 2050 is 808 million, but since the 725 million is the closest from the options provided I chose that one.
Both of these regions have nice demographic pictures at the present, having birthrates that increase the population, but moderately, as the birthrates are not high as well.
Over the past few decades, the birthrates in these two regions gradually are declining, and that process is expected to continue. Also, the life expectancy has gradually been becoming bigger, so the population has been moderately, but steadily growing.
It is expected though, that in about three decades, these regions will come to a demographic situation similar to the Western countries, where the birthrates will drop even further, and the population will start aging.