Which Letter will come in the place of question mark (?) ? AB, DEF, HIJK, ?, STUVWX

LMNO QRSTU LMNOP  MNOPQ

MNOPQ

(A B) /  C / (D E F) / G  / (H I J K) /  L  / {M N O P Q} /   R   / (S T U V W X)