C, the graph is not a straight line, meaning that for every x value, a definite y value is not present. The graph is an exponential graph, meaning that for every x value, the y value is related to the power of x.
Food for (your) thought: 1. Is this the graph of a straight line? 2. What does a proportional relationship look like? 3. If a graph passes through the origin, does that mean that the function it represents is proportional?
If you answer these questions correctly, you'll be in a better position to elimiinate the incorrect answer choices.
