What are the three tools used to assess a guest's level of intoxication?

The correct choice highlights essential components for evaluating a guest's level of intoxication. Counting drinks provides a quantitative measure of alcohol consumption, offering insight into how much alcohol a person has ingested over a certain period. Observing signs of intoxication allows staff to assess physical and behavioral indicators such as speech patterns, coordination, and overall demeanor, which are critical in determining if someone is impaired. Finally, identifying risk factors involves understanding individual differences, such as body weight, tolerance, and past drinking behaviors, which can influence how alcohol affects each person. This combination of methods offers a comprehensive approach to responsibly serving alcohol and ensuring the safety of patrons.

The other options include elements that do not provide the same level of practical assessment in real-world scenarios, such as breath tests or focusing on sobriety indicators rather than intoxication signs, which are not as effective for this specific context.