Mr. back woods purchased 20 acres of land near state university. although he frequently calls the police and posts "no trespassing" signs, college-age students frequently delight in camping in his woods and swimming in his lake that sits in the middle of the property. one unfortunate day, ethel hooper, state university's star diver, was permanently paralyzed when she struck a large underwater rock while diving into woods' lake with other students. when woods bought the property, the land survey showed him that the lake contained submerged rocks and other obstructions. woods had thought about posting a sign near the lake warning of these obstructions but decided not to bother. hooper sues woods, using premises liability law. did breach a duty to hooper? (a) yes because woods owed a duty to make the lake safe (b) yes because woods knew about the obstructions and should have posted warning signs. (c) no, because all woods was required to do was refrain from intentional conduct (d) no because trespassers have no legal rights of any kind when they are trespassing.