Which of the following sentences is NOT mentioned in the passage?( )
A
Professor Matsuzawa suggested that people should use their brains more often because thinking can stop the brain from contraction.
B
The professor’s tests prove that old people’s brains have contracted more quickly than other young people’s.
C
The research findings are based on the study of the brain sizes of different people.
D
The team of doctors made these tests in order to show how the brain works.