(Watch the video 5:46-9:45) The teacher presented the task with slides and key words in different colors. What could be the possible reasons for the teacher to do such integration?

A、She may want to draw students' attention.;
B、She may want to arouse students' interest.;
C、She may want to increase the difficulty level of the task.;
D、She may want to reduce the difficulty level of the task.