A project health check identified a risk that your project would not be completed on time. Several projects are competing for the same resources, and a serious resource conflict is emerging. As a result, you are quantifying the project’s risk exposure and determining what cost and schedule contingency reserves might be needed. You performed a schedule risk analysis using Monte Carlo analysis. The basis for your schedule risk analysis is the：
A、WBS
B、Gantt chart
C、Schedule network diagram and duration estimates
D、Probability/impact risk rating matrix