Based on geographical and historical analysis, most people in Canada live in southern Ontario and Quebec because:
"They have a milder climate and a long growing season."
- This is because a milder climate is more favorable to live in.
- A milder climate is characterized by its average rainfall, summer, winter, and other climatic condition such as cool and warm weather at an appropriate rate or level.
- Also, a long growing season means many people can farm and grow different and various types of food crops in a year which makes the food plenty for survival.
Hence, in this case, the correct answer is option B "They have a milder climate and a long growing season."
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