Fluency disorders are primarily concerned with:

Fluency disorders are primarily focused on the flow and rhythm of speech, which encompasses how smoothly and effortlessly a person speaks. Individuals with fluency disorders may experience interruptions in their speech, such as repetitions, prolongations of sounds or syllables, or blocks where speech is halted altogether. These disruptions affect not only the speaker's ability to communicate effectively but can also influence their confidence and social interactions.

Understanding fluency disorders involves recognizing that the emphasis is on the production of speech rather than language structure, comprehension, or response length. As such, option A correctly identifies the central concern of fluency disorders.