B is correct. The problem with the original code is that Sheep tries to implementHerbivore and Herbivore declares that its type parameter E can be anytype that extends Plant. Since a Sheep is not a Plant, Herbivore makes nosense— the type Sheep is outside the allowed range of Herbivore's parameter E.Only solutions that either alter the definition of a Sheep or alter the definition ofHerbivore will be able to fix this. So A, E, and F are eliminated. B works, changingthe definition of an Herbivore to allow it to eat Sheep solves the problem. C doesn'twork because an Herbivore must have a munch(Plant) method, notmunch(Grass). And D doesn't work, because in D we made Sheep extend Plant,now the Wolf class breaks because its munch(Sheep) method no longer fulfills thecontract of Carnivore.