Final answer:
The consequence of alcohol impairment on a vessel in Ontario is primarily slower reaction time, which can increase the risk of accidents and impair the operator's ability to navigate safely.
Step-by-step explanation:
The impact of alcohol impairment on a vessel in Ontario includes a range of negative effects on the operator's physical and cognitive abilities. Among these, the consequence most relevant to the question is C) Slower reaction time. Alcohol consumption, particularly in excess, leads to decreased reaction time, as well as reduced visual acuity, alertness, and behavioral control. For those operating a vessel, such impairments can significantly increase the risk of accidents and injuries.
For instance, the cerebellum, which is crucial for coordinated movements and balance, is very sensitive to ethanol, affecting balance and motor function. This, combined with the effects on the central nervous system, results in impaired judgment and difficulty in performing tasks that require focus and precision.