Which Statement Best Characterizes the Use of Psychophysiological Research Methods

Which statement best characterizes the use of psychophysiological research methods?

A) A researcher lives within a culture or subculture and makes extensive naturalistic observations of the member's physical attributes.
B) A researcher measures the relationship between physiological processes and various aspects of behaviour.
C) A researcher gathers extensive information about a few individuals regarding physical features that relate to cultural circumstances.
D) A researcher randomly selects participants for the study.