Explanation
Correct answer: B.
Choice B is the best answer because it presents a statement about how Richard Wagner achieved moments of extremely high volume in his operas that is supported by the text. The text states that European composers experimented with volume in their works by increasing the number of musicians in the orchestra and provides the example of Wagner, who "added more horns, trombones, and tubas to the orchestra." The text explains that by having more of these instruments playing at the same time, the overall volume of the orchestra could be dramatically increased at key moments in Wagner’s operas.
Why the other choices are wrong
Choice A
Choice A is incorrect because the text never indicates that Wagner moved his operas indoors to achieve moments of extremely high volume, nor does it indicate that his operas were previously performed outdoors. The only technique discussed in the text for achieving extremely high volume is Wagner’s addition of more instruments to create a bigger, louder orchestra.
Choice C
Choice C is incorrect because the text never says that Wagner built or used a specially designed concert hall to increase volume through echoes. The only technique discussed in the text is Wagner’s addition of more instruments to create a bigger, louder orchestra.
Choice D
Choice D is incorrect because the text never mentions any special training for singers related to volume or singing for extended periods. The text’s focus is entirely on the orchestra and how Wagner and other European composers used instruments to experiment with volume in their musical works.