What type of research angle falls under articulatory phonetics?

The correct choice focuses on the study of how speech is produced, specifically examining the positions and movements of the speech organs, such as the tongue, lips, and vocal cords. Articulatory phonetics is concerned with how these physical structures create sounds during speech, allowing researchers to understand how different configurations yield various phonetic sounds.

This option is accurate because articulatory phonetics analyzes the specific articulatory gestures involved in the production of speech sounds. By studying how speech organs interact and what positions they take, researchers can classify sounds based on their articulation, contributing to the broader field of phonetics and linguistics.

In contrast, the other options pertain to different areas: evaluating sound wave properties relates to acoustic phonetics, measuring brain responses is associated with neurolinguistics, and examining word meanings pertains to semantics. Each of these areas focuses on different aspects of language and communication, highlighting the diversity within linguistic research.