In the diagram, JK=JLJK = JLJK=JL, JN=JMJN = JMJN=JM and angle KJM=30°KJM = 30°KJM=30°. What is the value of angle NMLNMLNML?(A) 712°7\dfrac{1}{2}°721° (B) 1212°12\dfrac{1}{2}°1221° (C) 15°15°15° (D) 1712°17\dfrac{1}{2}°1721° (E) 20°20°20°