Answer
C. 9 kilogram meters/second
Step-by-step explanation
Inpulse of a force = force(N) × time(s)
Since the force is not constant for the given time, Impulse of force will be will the area under the graph of force against time.
The area of the graph shown = 1/2 × 6 × 3
= 3 × 3
= 9
Answer = C. 9 kilogram meters/second