Final answer:
According to the given information, sources of population increase in British Columbia include immigration, emigration, and inter-provincial migration.
Step-by-step explanation:
According to the given information, sources of population increase in British Columbia include immigration, emigration, and inter-provincial migration.
Immigration is the movement of individuals into a country to take up permanent residence. Emigration, on the other hand, refers to the movement of individuals out of a country to another place of permanent residence.
Therefore, the correct answer is D. A & C, which includes both immigration and inter-provincial migration.