I think that process is called erosion
The correct answer to this open question is the following.
Although there are no options attached we can say the following.
Canada is a great country. Indeed, a country with a great quality of life. That is why many immigrants want to go to Canada, to improve their living conditions.
Canada’s immigration policies reflect the underlying values of its citizens and impact Canadian history because these policies reflect the Canadian values that welcome people and support diversity as long as immigrants understand that they have to respect Canadian laws and the culture, traditions, history, and beliefs systems of this nation.
Canada has welcomed immigrant workers when the country has labor shortages and needs specific skills for workers, for instance, in agriculture.
D. Taiga. It says the it contains the largest expanse of untouched boreal forest in the world.
Taiga is the world's largest land biome, making up 29% of the world's forest cover. The largest areas are located in Russia and Canada. The taiga is the terrestrial biome with the lowest annual average temperatures after the tundra and permanent ice caps.