B is the answer hope this helps
The correct answer is <u>Cappella</u>
choral music music sung by a choir with two or more voices assigned to each part of the melody. The name of the musical form refers to vocal music “in the style of the chapel” without instrumental accompaniment. A cappella music was only rarely performed with instruments that duplicated the vocal line.
Hope this helps! :)
The aspect of of instruments that improved during the Romantic period was the valves. The correct answer is D, valves.
I think the answer is A but that’s juss my opinion.
