单选题 ______ is one of the factors that tend to promote social change.

【正确答案】 D
【答案解析】综合判断题。第一段第六行提及“All these factors tend to promote social change…”,这里的“factors”指上下文中所提到的“…more different ways of…”,“more ideas”,“more disagreements in interest”等,也就是D项中所说的“Different points of view”。