Which of the following are accurate statements about ash trees, according to the passage?

Which of the following are accurate statements about ash trees, according to the passage?

I. Ash trees with ash yellows disease are easily
cured.
II. Ash trees infected with ash yellows usually die
after having the disease for two to ten years.
III. Ash trees infected with ash yellows do not
usually recover.
IV. Ash trees infected with ash yellows sometimes
appear to recover in the spring.