Final answer:
The term for an individual's style of walking is called their 'gait,' which can vary based on rhythm, speed, and stride and can be affected by health conditions (option B).
Step-by-step explanation:
An individual's style of walking is referred to as his or her gait. This term encompasses the manner in which a person walks, including the rhythm, speed, and stride length. Changes in gait can sometimes indicate health issues or conditions, as seen in individuals with Parkinson's disease, who may have an awkward, stooped gait. In contrast, a gag reflex is an involuntary reaction that helps prevent choking; the gap phenomenon relates to the time lag in our perception of moving stimuli; gaze refers to the direction and focus of one's eyesight; and hyperextension is a joint movement that exceeds its normal range of motion.
Hence, the answer is option B.