Concept:Selecting the tool that can lift delicate seedlings gently without causing root damage.
Explanation:A dibber is used only for making planting holes, not for lifting seedlings.
A hoe is a heavy tool meant for weeding or loosening soil, so it is unsuitable.
A hand trowel works well for digging small holes or moving loose soil, but it can damage young roots.
A hand fork has thin, curved prongs that can slide beneath the roots.
This allows tomato seedlings to be lifted carefully from the nursery bed with their root system intact.
Therefore, the hand fork is the appropriate tool for lifting tomato seedlings for transplanting.
Answer:D. hand fork