Final answer:
The set of terms arranged from softest to loudest in music is c. mezzo forte, forte, fortissimo. The loudness of sound in music is indicated by intensity level or decibel, and it is not related to the frequency, which affects pitch.
Step-by-step explanation:
The terms used to describe the loudness of sound in music are dynamics, and they are indicated in sheet music with Italian abbreviations. The specific terms you need to arrange from softest to loudest are:
- Mezzo forte (mf) - moderately loud
- Forte (f) - loud
- Fortissimo (ff) - very loud
Therefore, the correct answer to which set of terms is arranged from softest to loudest is c. mezzo forte, forte, fortissimo.