question: In parallelogram J K L M, diagonals J L and K M intersect at point R, and ML is 45, KL is 21. Find m \angle K J L if J K = 2 b + 3 and J M = 3 a.
  Choices:
  A:30
  B:70
  C:80
  D:100
query_wo: Please directly answer the question and provide the correct option letter, e.g., A, B, C, D.
  Question: In parallelogram J K L M, diagonals J L and K M intersect at point R, and ML is 45, KL is 21. Find m \angle K J L if J K = 2 b + 3 and J M = 3 a.
  Choices:
  A:30
  B:70
  C:80
  D:100
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: In parallelogram J K L M, diagonals J L and K M intersect at point R, and ML is 45, KL is 21. Find m \angle K J L if J K = 2 b + 3 and J M = 3 a.
  Choices:
  A:30
  B:70
  C:80
  D:100
question_for_eval: In parallelogram J K L M, diagonals J L and K M intersect at point R, and ML is 45, KL is 21. Find m \angle K J L if J K = 2 b + 3 and J M = 3 a.
  Choices:
  A:30
  B:70
  C:80
  D:100