Explanation:

The kinematic similarity between the model and prototype refers to the similarity in the motion or movement characteristics between the two. It means that the model and prototype exhibit similar behavior in terms of their motion or discharge.

Shape:
Shape refers to the physical appearance or form of an object. While the shape of the model and prototype may be similar, it does not necessarily guarantee that their motion characteristics will also be similar. Therefore, shape alone cannot be considered as the correct answer.

Stream:
Stream refers to the flow of fluid, such as water, in a channel or conduit. The stream behavior may vary depending on factors such as velocity, turbulence, and flow rate. While the stream may have similar characteristics in both the model and prototype, it does not directly reflect the kinematic similarity between the two.

Forces:
Forces refer to the external influences that act on an object and affect its motion. While the forces acting on the model and prototype may be similar, it does not necessarily guarantee that their motion characteristics will also be similar. Therefore, forces alone cannot be considered as the correct answer.

Discharge:
Discharge refers to the volume of fluid passing through a channel or conduit per unit time. It is a measure of the flow rate. In terms of kinematic similarity, it is important for the model and prototype to have similar discharge characteristics. This means that the rate at which fluid flows through the model should be proportional to the rate at which fluid flows through the prototype. This ensures that the motion characteristics, such as velocity profile and turbulence, are similar between the two. Therefore, the correct answer is option 'B' - discharge.

In summary, kinematic similarity between the model and prototype is related to their motion characteristics. While shape, stream, forces, and discharge are all important factors, discharge is the most relevant in determining kinematic similarity.