Correct option is C
Given:

From the given figure 1 and 2
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.
In the first dice and second dice. The number 5 is common.
5 7 6
5 8 9
Thus, the opposite number of 8 is 7.
Correct answer is (c) 7









