Final answer:
Christopher Plummer's reference to individuals who would be overwhelmed by Canadian weather speaks to Canadians themselves, as they are the ones who experience the wide range of weather conditions that are characteristic of Canada.
Step-by-step explanation:
Christopher Plummer states that nature "is the dilemma of Canada" and that the weather would "overwhelm anyone who lived here." Given the context provided, Plummer is most likely speaking about A. Canadians, as the dilemma and overwhelming weather refer to the experiences of those who reside in Canada and have to endure its significant seasonal weather changes and challenges.