Answer: D 48 kg
Step-by-step explanation:
The object that has the higher inertia is object D. This is because it has the heaviest weight, 48 kg > 24 kg > 12 kg > 6 kg. The heavier an object's weight is, the more inertia this object has.
You can think about it as trying to move a larger boulder over trying to move a small pebble, the boulder will be heavier and harder to move (having more inertia).