___ are voiced sounds during the production of which the air escapes through the mouth freely and continuously, unaccompanied by any audible frictional noise.
AConsonants
BDiphthongs
CVowels
DSemi-vowels
Answer:
C. Vowels
Read Explanation:
Vowels are:
Voiced sounds (produced with vibration of the vocal cords).
Made when the air escapes freely through the mouth, without any significant obstruction or friction.
The shape of the oral cavity changes to produce different vowel sounds, but no audible friction is created.