单选题In approximating costs, the estimator considers the possible causes ofvariation of the cost estimates, including（）AbudgetBplanCriskDcontract
单选题
In approximating costs, the estimator considers the possible causes ofvariation of the cost estimates, including（）
A
budget
B
plan
C
risk
D
contract
参考解析
解析：
该题的关键词为"approximating costs、 causes ofvariation"，其语句结构为"the estimator （主语）considers（谓语）the possible causes ofvariation of the cost estimates, including（）"，含义为"估算人员考虑对成本估算可能造成影响的原因，包括什么"。估算成本考虑不确定性，而不确定性正是风险的一个基本特征，所以选择选项C。
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