AFCAT Model Paper 1

According to the English alphabet series and its positional value: The logic follows here is:

L	M	N
↕	↕	↕
O	N	M

ReversePositional Letter
Similarly;

E	W	L
↕	↕	↕
V	D	O

ReversePositional Letter
Hence, "EWL : VDO" is the correct answer.