Which aspect of speech does articulation primarily focus on?

Articulation primarily focuses on sound production by the speech organs. This aspect involves how different parts of the vocal tract, including the tongue, lips, teeth, and palate, work together to create specific sounds. Effective articulation is crucial for clear speech, as it determines how accurately sounds are formed and perceived. This includes not just the formation of individual phonemes but also the transitions between them as words and phrases are spoken.

The other options relate to different aspects of language and communication. Intonation patterns involve the pitch and melody of speech rather than the physical production of sounds. Word meaning and pronunciation address understanding and correctly saying words, which is broader than just the mechanics of articulation. Sentence structure pertains to grammatical arrangements of words, rather than the production of sounds. Therefore, the focus of articulation on the physiological act of sound production makes it the correct answer in this context.