The correct option is C S and V
Given, W cannot be in R's group.
So, W can be either with S or T.
Now, T is n't given in any of the option. Therefore, W is with S.
Now, U can't come with S and W as X must be in a group with S or U or both.
Therefore, V will come in the group with S and W.
Hence, option (C) is the correct answer.