单选题 The process of (17) schedule activity durations uses information on schedule activity scope of work, required resource types' estimated resource quantities, and resource calendars with resource availabilities.

【正确答案】 A
【答案解析】[分析] 估算进度活动历时的过程会用到进度活动工作范围、所需资源类型、估计的资源数量，以及建立在资源可用性上的资源日历等信息。