Which of the following is a graph of y = 1/2 x^2?

Answer is A.
For a quadratic function, the rule at finding the points it to square the x value and then multiply by the coefficient to get the y.
So
X Y
-2 2
-1 .5
0 0
1 .5
2 2

And by looking at these points, A matches perfectly

I believe the correct graph for y = 1/2 x^2 is the first graph. To graph this equation, you must create an x,y chart. 
Ex.) x , y
       -2, 2
       -1, 0.5
        0, 0
        1, 0.5
        2, 2

C. because 6÷3=2 so 3 is half of six so 3/6