Caroline was overjoyed when she learned that she had won a ______ from Cambridge. (scholar)

A．it makes human beings feel less guilty
B．it indicates that animals also have fights
C．it helps improve people’s treatment of animals
D．it proves that dogs are superior to other animals

A．lead to less difficult evolution process
B．result from more sophisticated social behaviour
C．are more necessary for survival than primary emotions
D．are less common among animals other than human beings