On some projects, especially ones of small
题型：单项选择题
问题：
On some projects, especially ones of smaller scope, activity sequencing, activity resource estimating. Activity duration estimating and (74) are so tightly linked that they are viewed as a single process that can be performed by a person over a relatively short period of time.
A．project planning
B．schedule development
C．cost estimating
D．time estimating