问题
What is the most accurate method of obtaining project information that can reduce the amount of risk？
A:Observations on the current project
B:Determining the risk by using brainstorming techniques
C:The use of historical data from previous projects that were similar in nature
D:Sensitivity analysisE.Delphi technique
B:Determining the risk by using brainstorming techniques
C:The use of historical data from previous projects that were similar in nature
D:Sensitivity analysisE.Delphi technique
正确答案是：
