Please consider the following figure. I have to find the best and worst options for W. From the list of preferences of W, the best option for W is D but there is no match of W with D in the 6 options. Therefore, option 1 is the best option in the context of W because A is the second preferred element of W.
Now C is the worst preferred choice of W. Therefore, options 5 and 6 are the worst choices of W.
X (worse: 4, better: 2)
And (Worse: 6, Better: 2)
Z (Worse: 6, Better: 1,2 and 3)
Someone please guide me.