单选题 The security rationale is very important for any scientific or technological endeavor because the budget of security- related programs is limited usually by that nation's comprehension of a hazard or redefine the idea of national security.
【正确答案】 B
【答案解析】[分析] 名词辨析 rationale 基本原理，理论基础；A．perception 理解，感知，感觉；B．reason理由，原因； C．passion激情，热情；D．reaction反应，反作用；因此此处的“安全原因”应用B。