Which of the Following Was an Effect on the Population

Which of the following was an effect on the population of older people caused by the waves of immigrants to Canada between 1901 and 1931?

A) Initially, the proportion of older people in Canada decreased as aged people returned to their countries of origin as new ethnic groups appeared.
B) The birth rate increased due to the number of young immigrants, resulting in a larger proportion of older people in Canada.
C) The number of older people increased dramatically because of the massive immigration of older people into Canada during the Great Depression.
D) As they aged, the young immigrants who had made Canada a young population began to add to the older population.