项目经理、团队成员以及若干相关方共同参与一次风险研讨会。已经根据风险管理计划 生成并提供一份风险报告。若要为各个项目风险进行优先级排序，现在必须执行哪一项分析？
The project manager, team members, and Several stakeholders participated in a risk workshop.A risk report was produced and delivered according to the risk management plan. What analysis must now be performed to prioritize individual project risks?
A：定量风险分析 Quantitative risk
B：根本原因分析 Root cause
C：偏差分析 Variance
D：定性风险分析 Qualitative risk
先自己做一做，答案和解析见下一页。