question: As shown in the figure, Xiaoming designed two right angles to measure the width of the river BC, then the width of the river BC is ()
  Choices:
  A:\frac{7}{2}m
  B:\frac{17}{2}m
  C:\frac{40}{7}m
  D:11m
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, Xiaoming designed two right angles to measure the width of the river BC, then the width of the river BC is ()
  Choices:
  A:\frac{7}{2}m
  B:\frac{17}{2}m
  C:\frac{40}{7}m
  D:11m
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, Xiaoming designed two right angles to measure the width of the river BC, then the width of the river BC is ()
  Choices:
  A:\frac{7}{2}m
  B:\frac{17}{2}m
  C:\frac{40}{7}m
  D:11m
question_for_eval: As shown in the figure, Xiaoming designed two right angles to measure the width of the river BC, then the width of the river BC is ()
  Choices:
  A:\frac{7}{2}m
  B:\frac{17}{2}m
  C:\frac{40}{7}m
  D:11m