Answer:
The correct answer is Cornu
Explanation:
The cornu is a bronze G-shaped instrument used by the Roman army to communicate orders to troops in battle. It is also known as curved tuba, had an approximate length of 3 meters
Guido d'arezzo contributed to the development of musical notation. Option B. This is further explained below.
Who is Guido d'arezzo ?
Generally, Guido d'arezzo aka Guido d'Arezzo, was an Italian High Medieval music theorist and educator who lived from from 991 to 1033.
In conclusion, He was a Benedictine monk who is widely recognized as the creator of the current staff notation, which profoundly impacted the evolution of Western musical notation and practice.
Read more about Guido d'arezzo
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I think is the first one will be better
