问题：
[单选题]视频中老师分别是从哪几个方面来点评和修改作业的？
in the vedio, from which aspect did professor critique on students works?
A.材料，用笔，用墨
material, brush using and ink using
B用笔，用墨，组织关系
brush using, ink using and organization of brush strokes
C造型，空间，用笔
the form, space and brush using
