A. Mass = 2.0 and Speed = 6.0

B. Mass = 4.0 and Speed = 5.0

C. Mass = 6.0 and Speed = 4.0

D. Mass = 8.0 and Speed = 2.0
Which object has the greatest inertia?

The object with the greatest inertia is the one with the greatest mass. Therefore, option D. Mass = 8.0 and Speed = 2.0 has the greatest inertia.