Final answer:
Option C, Scanning systems, does not measure physiological reactions like the other options which measure eye movement, pupil size, and voice pitch.
Step-by-step explanation:
The correct option that does not measure physiological reactions is Scanning systems (C). Physiological reactions are typically assessed using tools that detect changes in our body as we respond to stimuli. An eye-tracking monitor (A) measures where and how the eyes move, often used in psychological studies and marketing research. A pupilometer (B) measures changes in pupil size, which can reflect arousal or cognitive load. Voice-pitch analysis (D) evaluates variations in the pitch of the voice that can indicate stress or emotional states.