Which of the following statements about the health belief model is not true?（下列关于健康信念模型的陈述哪一项是不正确的？）
选项：

A:Health belief model was originally developed in the 1940s.（健康信念模型最初发展于20世纪40年代）;
B:Health belief model updated in the 1980s.（20世纪80年代更新的健康信念模型）;
C:The health belief model contains 6 key variables.（健康信念模型包含6个关键变量）;
D:Perceived susceptibility is one of the key variables in the health belief model.（感知易感性是健康信念模型的关键变量之一）