Consider a differential equation d y / d t = f ( y ) {\displaystyle dy/dt=f(y)} . Shown in A-D is the phase line (state space) diagram ( f ( y ) {\displaystyle f(y)} versus y {\displaystyle y} ). Which of the following is the correct pairing of these sketches with the sketch of a solution y ( t ) {\displaystyle y(t)} to the differential equation?