Sounds produced with an open vocal track without any interruption of the tongue areAaffricatesBbilabialsCvowelsDconsonantsAnswer: C. vowels Read Explanation: Vowels – Air flows freely through the mouth; no complete closure or strong friction.Consonants – Produced with some form of obstruction in the vocal tract.Bilabials – Consonants made with both lips (like /p/, /b/).Affricates – Consonants that begin as stops and release into fricatives (like /ch/, /j/). Read more in App