Answer:
D
Explanation:
Each group has
3 red
3 blue
2 yellow
That's a total of 3 + 3 + 2 = 8 marbles per group
Also, there are 8 same type of groups, so total number of marbles in 8 groups would be:
8 * 8 = 64
Total marbles = 64
Answer choice D is right.