Thank goodness, the damage to the car was neglectful.

The speaker in th sentence is expressing relief ("Thank goodness") that the car's damage was presumably minor or insignificant.

The correct answer is "was negligible" (Option A) because it means the car damage was so minor it didn't matter- matching the relieved tone. The other options are wrong: "neglecting" (Option B) is grammatically incorrect here, "neglectable" (Option C) isn't a real word, and "negligent" (Option D) refers to careless behaviour rather than damage severity. Only "negligible" properly describes trivial damage worth ignoring, making Option A the correct choice here.