Answer:
B
Step-by-step explanation:
The net folds into the cube cube shown beside it.
When F is at the top E is at the bottom
So, F is opposite to E
When C is at the top A is at the bottom
So, C is opposite to A
When D is at the top B is at the bottom
So, D is opposite to B
Thus we can conclude the B is the letter which will be on the side opposite D.