Select the letter-cluster from among the given options that can replace the question mark (?) in the following series.
EDC JIH ONM TSR ?
AYWX
BWYX
CYXW
DWXY
AYWX
BWYX
CYXW
DWXY
Related Questions:
What should come in place of '?' in the given series based on the English alphabetical order?
MOR KMP IKN GIL ?