Decide whether the function is linear or nonlinear. Explain. Choose the correct answer below. A. The function is linear because the rate of change is constant and the graph of the function is a line. B. The function is linear because the rate of change is not constant and the graph of the function is not a line. OC. The function is nonlinear because the rate of change is constant and the graph of the function is a line. D. The function is nonlinear because the rate of change is not constant and the graph of the function is not a line. What mistake might the student have made? OA. She said the function is nonlinear, but the function is linear. B. She said the rate of change is constant, but the rate of change is not constant. OC. She said the graph of the function is not a line, but it is a line.