(Watch the video 00:00-05:45) In the lead-in stage, which of the following did the teacher do exactly?

A、She set up a real situation and asked students to help solve the difficulties.;
B、She set up a scenario and asked students to look for answers on the map.;
C、 She set the task and asked the students to complete it independently.;
D、She asked several questions for the students to answer independently.