题目内容：
Management has decided to “crash” a project in order to avoid penalty payments for late deliveries．Additional costs are expected．To crash the project, either overtime or additional resources should be assigned to:（ ）A．All activities
B．Only those activities with the longest time durations C．Those activities on the critical path beginning with the lowest additional cost activities
D．Those activities with the greatest degree of risk A．所有的活动
B．只是那些具有最长的持续时间的活动
C．那些在关键路线开端上的具有最低的额外费用的活动
D．那些风险度最大的活动
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答案解析：