America is growing older．Fifty years ago, only 4 out of every 100people in the United States were 65 or older．Today,10 out of every 100 Americans are over 65．Theaging of the population will affect (影响)American society in many ways-education, medicine, and business．Quietly, the graying of America has made us avery different society-one in which people have a quite different ideaof what kind of behavior (行为)is suitable (合适) at various ages.The underlined word “one” in the first paragraph refers to ________ .A.a societyB.AmericaC.a placeD.population
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A解析One指代前面提到的society