Final answer:
Singing is more difficult than speaking because it requires a greater supply of air and breath control, longer vowel sounds, and wider ranges of pitch and volume.
Step-by-step explanation:
It is more difficult to sing than speak because:
- Singing demands a greater supply of air and control of breath, as the vocal cords need more air to vibrate consistently and produce sound.
- Vowel sounds are held longer in singing than in speaking, requiring more breath control and muscle coordination.
- Wider ranges of pitch and volume are used in singing than in speaking, requiring more control and precision in vocal techniques.
Therefore, the correct answer is D) all answers are correct.