This year’s Nobel Peace Prize has been awarded to a(n) ______.

A．The adaptations of the African grass mouse to its environment.
B．The sleeping habits of the African grass mouse.
C．The effect of intense sunlight on the diet of the African grass mouse.
D．The habitat of the African grass mouse.

A．They like to have music in the operating room.
B．They solved problems better while listening to music they liked.
C．They preferred classical music.
D．They performed better when they used headphones.