Which disaster, Three Mile Island, Fu kushima, or Chernobyl, was the worst for the environment, and why?

I hope it helps:

Explanation:

There's clear evidence that Chernobyl was the world's worst nuclear accident. Whereas residents near Three Mile Island eventually returned home, the citizens of Pripyat did not. Today, Chernobyl still has a 1,000-square-mile exclusion zone that restricts access to visitor

:)

it would be c. xylem.