In this type of questions, two groups of alphabets related to each other in same way, are given. The candidate is required to find out this relatonship and choose a group of alphabets which is related in the same way to a third group provided in the question.
QIOK : MMKO : YAWC : ?
The first and third letters of the first group are each moved four steps backword to obtain the corresponding letters of the second group. The second and fourth letters of the first group are each moved for steps forward to obtain the corsponding letters of the second group.
A similar relationship will exist between the third and the fourth groups.
Hence, the answer is (d).