A project manager is working with a quality assurance (QA) expect to determine the reason behind a number of quality variances and defects in a production line. What should the project manager use to identify the problem’s origin? 项目经理正在与质量保证（QA）专家合作，以确定生产线中许多质量偏差和缺陷背后的原因。项目经理应该使用下列哪一项来确定问题的根源？ ◑A. Histogram直方图 ◑B. Scatter diagram散点图 ◑C.Matrix diagram矩阵图 ◑D.Fishbone鱼骨图
