Final answer:
The economic effects of aging for Canada will primarily be a decline in labor supply and a reduction in real GDP per capita.
Step-by-step explanation:
The economic effects of aging for Canada will be principally the result of a decline in the availability of labor supply in relation to an aging and increasingly dependent population, with a consequent reduction of real GDP per capita (option A). As the population ages and more people retire, there will be a decrease in the number of people available to work, leading to a decrease in the labor supply. This can result in a lower GDP per capita as there are fewer workers contributing to the overall economy.