参与式观察法的优点是?What is the merit of participant observation()
A.能够获得统计上的最大样本量 It’s able to acquire the largest samples of statistics B.它所获取的资料最容易量化It’s easy to make a quantification C.它能最大程度地获得社会现实的真实图像It’s able to acquire the real images of social realities D.它的观察过程最具系统操作性The process of observation demonstrates a highly operable feature