Answer
Graph: C
Contour map: II
Work Step by Step
Graph is C
First, the value of the function must be 0 along the lines x=0 and y=0. Next, we know the graph is sinusoidal when either x or y is a constant value and the other is a variable.
Contour map is II
As we can see from the graph of C, the values along the top edge of the surfaces have the same z value. We can also see this from the cross section where either x or y is constant. The sinusoidal function has the same maximum value as it's value changes periodically.
