question: so the width of the water surface AB is ()
  Choices:
  A:4m
  B:5m
  C:6m
  D:8m
query_wo: Please directly answer the question and provide the correct option letter, e.g., A, B, C, D.
  Question: so the width of the water surface AB is ()
  Choices:
  A:4m
  B:5m
  C:6m
  D:8m
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: so the width of the water surface AB is ()
  Choices:
  A:4m
  B:5m
  C:6m
  D:8m
question_for_eval: so the width of the water surface AB is ()
  Choices:
  A:4m
  B:5m
  C:6m
  D:8m