In trapezoid J K L M, J K is parallel to M L. J M = 6, K L = 6, and \angle J M L is 80 degrees. Find m \angle K.
Choices:
A:6
B:60
C:100
D:180
Please directly answer the question and provide the correct option letter, e.g., A, B, C, D.
Question: In trapezoid J K L M, J K is parallel to M L. J M = 6, K L = 6, and \angle J M L is 80 degrees. Find m \angle K.
Choices:
A:6
B:60
C:100
D:180
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 trapezoid J K L M, J K is parallel to M L. J M = 6, K L = 6, and \angle J M L is 80 degrees. Find m \angle K.
Choices:
A:6
B:60
C:100
D:180