John wanted to investigate Newton's second law to see how changing the force applied to an object affects the object's motion. He used eight different values of force applied to the same object, which had a mass of 1 kg. This resulted in eight different values for acceleration. John's results are shown in the graph below, which plots force vs. acceleration for the 1-kg object. Examine the graph, and then answer the question that follows. Based on the graph above, it can be concluded that
A. the acceleration of an object decreases as the force applied to the object increases.
B. the acceleration of an object remains the same as the force applied to the object increases.
C. the acceleration of an object increases and decreases randomly as the force applied to the object increases.
D. the acceleration of an object increases as the force applied to the object increases.
