JAK, KBL, LCM, MDN, _____ Choose the most appropriate option:
A) NEO B) SAS C) DFG D) JKL E) JHN
This is an alternating series in alphabetical order. The middle letters follow the order ABCDE. The first and third letters are alphabetical beginning with J. The third letter is repeated as a first letter in each subsequent three-letter segment.   NEONSWER:NEO
<result>A</result>
JAK, KBL, LCM, MDN, _____