Please consider the figure below. I have to find the best and worst options for W. From the preference list of W, the best option for W is D but there is no matching of W with D in all the 6 options. Thus option 1 is the best option in the context of W because A is the second preferred element of W.
Now C is the worse preferred option of W. Thus option 5 & 6 are the worse options of W. X (worst : 4, Best:2) Y (Worst : 6, Best:2) Z (Worst: 6, Best: 1,2 &3)
Somebody please guide me.