The correct answer is B. Force-time diagram.
Impulse is the change in momentum of an object. It is equal to the product of the force acting on the object and the time during which the force acts.
A force-time diagram shows the relationship between the force acting on an object and the time during which the force acts. The area under the curve of a force-time diagram is equal to the impulse.
A velocity-time diagram shows the relationship between the velocity of an object and the time during which the object is moving. The area under the curve of a velocity-time diagram is equal to the change in the object’s momentum.
A velocity-displacement diagram shows the relationship between the velocity of an object and the displacement of the object. The area under the curve of a velocity-displacement diagram is equal to the work done on the object.
Therefore, the only diagram that can be used to calculate impulse is a force-time diagram.