Final answer:
The startle response is characterized by motor reflex and physiological arousal. Sensitization occurs when there is an increased responsiveness to repeated stimuli. Option A is correct.
Step-by-step explanation:
The startle response is a series of physiological and behavioral responses that occur in dangerous situations. It is characterized by increased heart rate, defensive/offensive behaviors, and inhibition of certain physiological functions. The components of the startle response include motor reflex and physiological arousal.
Sensitization occurs when there is an increased responsiveness to repeated stimuli. This means that the startle response becomes stronger over time. For example, someone who is repeatedly exposed to a loud noise may experience a stronger startle response each time.
Therefore, the correct option is A) Components: motor reflex, physiological arousal; Sensitization: increased responsiveness to repeated stimuli.