Which of the following best describes 'dysarthria'?

Dysarthria is best described as a disorder involving muscle weakness for speech. This condition results from neurological damage that affects the muscles responsible for production of speech, leading to slurred or slow speech that can be difficult to understand. Individuals with dysarthria may have good language comprehension and cognitive abilities; however, their speech is impaired due to the physical inability to control the muscles used in speaking.

The other options focus on different language-related disorders. For example, some involve comprehension issues or cognitive aspects of language, which do not align with the primary characteristics of dysarthria. Therefore, the emphasis on muscle weakness for speech clearly identifies the nature of dysarthria, distinguishing it from disorders related to language comprehension or retrieval.