How Did Physiologists and Physicists,like Gustav Fechner,contribute to the Development

How did physiologists and physicists,like Gustav Fechner,contribute to the development of psychology as a science?

A) They studied the relationship between the physical world and the mental representation of that world.
B) They demonstrated that the brain was responsible for consciousness.
C) They identified the physical properties and locations of specific functions within the brain.
D) They extended Darwin's theory of evolution to behaviour and cognitive abilities.