Option C
physiological kind of independent variable is being used
Explanation:
Variables are regularly employed in psychology trials to discover if modifications to one thing appear in variations to another. Physiological measurement includes the direct or indirect detection of variables attributable to the standardizing functioning of methods and subsystems in the human body.
The devices and procedures of this system are diverse, but all are based on experimental investigation. The variables examined are obtained from the proscribed features and roles of the biological systems and subsystems. The independent variable is that is regulated and managed by the experimenter. Here aspects such as heart frequency, the cortical action, etc can be assigned as the variable for an experiment.
