A dice has its faces named by letters B, C, D, R, S and T. Two positions of the same dice are given below. Which face is opposite to face R?

Logic: ​If two dice have the same face value in the given image then their clockwise or anticlockwise wise number are known as opposite numbers in dice.

Common face to Clock wise rotate:

So, the opposite face of R will be B.

Thus, the correct option is (b)