In approximating costs, the estimator considers the possible causes of variation of the cost estimates, including   （ ）。

In approximating costs, the estimator considers the possible causes of variation of the cost estimates, including   （ ）。

A.budget 

B.plan 

C.risk 

D.contract

参考答案：C

参考解析：在估算成本时，估算者会考虑成本估算偏差的潜在原因，包括风险。