Final answer:
On a radar reflectivity image, the tornado would be coincident with the "debris ball" echo. The term for the eye of the storm is the center of rotation, where winds are weaker due to the inverse proportionality of tangential velocity to radius of curvature.
Step-by-step explanation:
If a tornado is present, it can be identified on a radar reflectivity image by looking for certain features. Among the options provided, the location of the tornado would be coincident with the "debris ball" echo.
A debris ball appears as an area of enhanced reflectivity and is caused by debris being lofted into the air by a tornado. The other features mentioned in the question are associated with the thunderstorm that may produce a tornado but are not where the actual tornado would be indicated on radar.
The eye of the storm, or the center of rotation, is where winds are weaker, as mentioned in the GRASP CHECK question. This is because the tangential velocity is inversely proportional to the radius of curvature, meaning the closer to the center, the slower the wind speeds tend to be. This is illustrated by option b in the GRASP CHECK, which is the correct answer.