Answer: 
Step-by-step explanation:
We have given the numbers = 2,0,1,9
We can use addition and subtraction operation to the given numbers such that the answer will be equals to 6.
We can add 2 ,0 and 1 and then subtract from 9 , we will get 6.
So the required expression can be

hence, the required expression can be 
I think it’s B and C. They are the same distance away from 0 but, they are on different sides. Therefore, they are opposites.
Draw triangles within the ramps and since they are right triangles, use the pythagorean theorem based on what was given and solve