question: As shown in the figure, the straight line a and the straight line b are intercepted by the straight line c, b perpendicular  c, the foot of perpendicular is the point A, angle 1 = 70.0. If the line b is parallel to the line a, the line b can be rotated () clockwise around the point A 
  Choices:
  A:70°
  B:50°
  C:30°
  D:20°
query_wo: Please directly answer the question and provide the correct option letter, e.g., A, B, C, D.
  Question: As shown in the figure, the straight line a and the straight line b are intercepted by the straight line c, b perpendicular  c, the foot of perpendicular is the point A, angle 1 = 70.0. If the line b is parallel to the line a, the line b can be rotated () clockwise around the point A 
  Choices:
  A:70°
  B:50°
  C:30°
  D:20°
query_cot: Please first conduct reasoning, and then answer the question and provide the correct option letter, e.g., A, B, C, D, at the end.
  Question: As shown in the figure, the straight line a and the straight line b are intercepted by the straight line c, b perpendicular  c, the foot of perpendicular is the point A, angle 1 = 70.0. If the line b is parallel to the line a, the line b can be rotated () clockwise around the point A 
  Choices:
  A:70°
  B:50°
  C:30°
  D:20°
question_for_eval: As shown in the figure, the straight line a and the straight line b are intercepted by the straight line c, b perpendicular  c, the foot of perpendicular is the point A, angle 1 = 70.0. If the line b is parallel to the line a, the line b can be rotated () clockwise around the point A 
  Choices:
  A:70°
  B:50°
  C:30°
  D:20°