题目内容：
Specifically, when risk communication are dealing with issues related to health risk information and preparation strategies, it will always concern about the following topics: 1）Agriculture Food; 2）Lack of Water Pollution; 3）（）; 4）Mental health and general Public Health; 5）Chemical, biological, radio-logical nuclear threats.
A.Safety and Happiness
B.Environmental and Air
C.Occupation and Nutritional
D.Disease and Vaccines
参考答案：