Six letters S, T, U, V, W and X are written on different faces of a dice. Two positions of this dice are shown in the figure. Which letter will be opposite to X?

Logic: ​In these types of dice problems, we should write all three numbers/letters in clockwise or anticlockwise from a fix common number/letter.

Common face to clock wise rotate:

So, opposite of X  is U.

Thus, the correct option is: (d) U