Question

The modern piano was originally called the "fortepiano" or "pianoforte" because of its

Answer 1

B. ability to change dynamics.

The pianoforte (in English soft-loud) was called in this way due to its ability to play both soft and loud notes. The pianoforte is an acoustic and stringed musical instrument invented by Bartolomeo Cristofori in the XVIII century,  although the exact year is still uncertain, in which the strings are struck by hammers.