<span>No longer than one or two sentences. If you write more than this, it'll drain out the evidence that supports the main idea. It could also be shorter if possible.</span>
<span>Since the pronoun comes after the predicate, I think "she" being used as a predicate nominative. So the answer is A:)</span>
A watershed is an area or ridge of land that separates waters flowing to different rivers , basins , or seas . I hope this helps