The word "literature" in the last sentence refers to ______.

A．anyone without breakfast does improve his performance
B．not giving people breakfast improves performance
C．having breakfast does not improve performance, either
D．people having breakfast do improve performance, too

A．breakfast does not affect performance
B．Dr. Pollitt is engaged in research work at an institution of higher learning
C．not eating breakfast might affect the health of children
D．professor Bender once taught college course in nutrition in London