Which of the following signs is indicative of alcohol intoxication?

Staggering is a classic sign of alcohol intoxication. When an individual consumes alcohol, it can impair their motor coordination and balance, leading to an unsteady gait or difficulty in walking straight. This is often observed as staggering, characterized by irregular and unsteady movements.

In contrast, increased alertness, improved speech clarity, and reduced drowsiness are not associated with alcohol intoxication; rather, they could suggest a state of sobriety or heightened stimulation, which does not align with the known effects of alcohol consumption. Alcohol generally leads to decreased alertness, slurred speech, and increased drowsiness or sedation, making staggering a clear and recognizable symptom of overconsumption.