Answer:
A. If you increase the volume of the sound, you increase the energy the sound waves are carrying.
Step-by-step explanation:
When you pluck the string with more power, you expend more energy. The string vibrates more as a result of the additional energy, allowing it to move more air particles over a longer period of time. When you pluck a string with vigor, it has more amplitude, which makes the sound louder when it reaches your ear.