问题：
[单选题] Project schedule management is made up of six management processes including: activity definition, activity sequencing, （ ） , and schedule control by order．
A、activity duration estimating, schedule developing, activity resource estimating
B、activity resource estimating, activity duration estimating, schedule development
C、schedule developing, activity resource estimating, activity duration estimating
D、activity resource estimating, schedule developing, activity duration estimating
参考答案：
B、activity resource estimating, activity duration estimating, schedule development
● 参考解析
