Answer:
D
Step-by-step explanation:
3 is the only option that goes into 39 and 6. If you have 2x's in the first set and 4 in the second, you can't take out 4 if you only have 2 in the first set. Same goes for the Y's. If you have 2 y's and try to take out 3. It won't work. So, your GCF is option D.
