(D ) S. ( A ) 15 Which of the following statements is NOT true? O Graph (C) and Graph (D) both have negative slopes, except for the "flat" portions where the slope is zero. Graph (C) and Graph (D) both indicate that S is decreasing over time t. Graph (A) and Graph (B) both have increasingly higher slopes over time. Graph (A) and Graph (D) both indicate that dS/dt is changing at an increasing rate. Graph (A) and Graph (B) both indicate that S is increasing over time t