which instrument originally did not have valves and was used by the military?\nbugle\neuphonium\ntuba

which instrument originally did not have valves and was used by the military?\nbugle\neuphonium\ntuba
Answer
Brief Explanations:
The bugle is a simple brass - wind instrument without valves and has been used historically in the military for signaling. Euphoniums and tubas are larger brass instruments with valves.
Answer:
A. Bugle