【正确答案】 D

【答案解析】[试题分析] 这是一道文章细节分析题。
[详细解答] 由文章第一段“The opinions held by any population are shaped and manipulated by several factors：individual circum stances，the mass media，special interest groups，and opinion leaders．”可知，人们的观点受到A，B，C三个方面的影响。所以答案D是正确的。