The graph shows Susan’s distance from her office, in yards, as she runs errands, over time, in minutes.
 For which values of t (time) is Susan’s distance from her office decreasing from 70 yd to 0 yd?
 A.
 from t = 0 to t = 6
 B.
 from t = 10 to t = 12
 C.
 from t = 16 to t = 22
 D.
 from t = 22 to t = 26