The population of country X in 1990 was 35 million. The births were 450,000 while it recorded 210,000 death. If in the year, its immigrants were 20,000 and ...

To calculate the total population of country X at the end of 1990, we need to add up the number of births, immigrants, and remaining citizens after accounting for deaths and emigration, and then subtract the number of deaths from this total. The number of births is 450,000, while the number of deaths is 210,000. So the net increase due to natural growth is 450,000 - 210,000 = 240,000. The net migration is the difference between the number of immigrants and emigrants, which is 20,000 - 10,000 = 10,000. Thus, the total population at the end of 1990 is: 35,000,000 (original population) + 240,000 (net increase due to natural growth) + 10,000 (net migration) = 35,250,000. Therefore, the total population of country X at the end of 1990 is 35,250,000. Option (D) is the correct answer.