The dice that has the numbers of spots on opposite faces add up to 7 is in options A and B
How to analyze the options
For each of the dice folding to find the total number gets the sum as follows
Option A
6 + 1 = 7
5 + 2 = 7
4 + 3 = 7
Option B
6 + 1 = 7
5 + 2 = 7
4 + 3 = 7
Option C (not selected)
5 + 1 = 6
6 + 2 = 8
4 + 3 = 7
Option D (not selected)
5 + 3 = 8
6 + 1 = 7
4 + 2 = 6