Read this sentence from the Florida Exotic Pest Plant Council website: Many parks and nature reserves manually remove invasive plants (and sometimes animals) with the help of local volunteers.

Which paraphrase best avoids issues of plagiarism?

Many places manually remove invasive plants and animals with help from others.
Parks and nature reserves remove invasive plants and animals with volunteers, manually.
Some areas use volunteers to remove plants and animals that are considered a threat.
With the help of local volunteers, many parks and reserves manually remove invasive plants and often animals.