Answer
$b$
Work Step by Step
In the graph $b$ of 3D surface it has been seen that in the surface there is a wave that goes from one side to the other.
Therefore, this tells us that the graph of 2D level curves has lines curved more when it travels along the axes .
The level curves has less curved when it moves furthest away from them which are in the middle of the quadrants as shown in the graph $b$.
