15 POINTS PLEASE HELP! NO GUESSING 
 A watershed is the land that water flows across or through on its way to a stream, lake, wetland, or other body of water. How do scientists recommend preserving a watershed?
 A.
 encourage agricultural usage in the watershed
 B.
 preserve forests and wetlands within the watershed
 C.
 create lakes by damming up rivers in the watershed
 D.
 increase construction within the watershed