How can alcohol impact a person's speech?

Alcohol impacts a person's speech primarily by affecting their motor skills and cognitive functions. When someone consumes alcohol, it can lead to slurred speech, where the words may run together or sound mumbled. This occurs because alcohol depresses the central nervous system, impairing the brain's ability to coordinate the muscles involved in speech production.

Additionally, intoxication can lead to incoherence, where the individual may struggle to form coherent thoughts or sentences, making it difficult to communicate effectively. This level of impairment can vary based on the amount of alcohol consumed and the individual's tolerance levels. Understanding this effect is crucial, particularly in contexts of social interactions, legal situations, or safety, where clear communication is essential.

The other options present misconceptions about alcohol's effects on speech, suggesting enhancements or no impact, which is contrary to the well-documented realities of alcohol consumption.