The correct answer here is<span> C. At what age do you think people should be allowed to go to dance clubs?
This is a descriptive quantitative question, which is the simplest form of quantitative questions, and it's goal is to simply measure a variable and examine the results.</span>
Answer:

Which country has the most revolutionary history?
The American country has the most revolutionry history.
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I believe the answer is Harmony.
The balance between dissonance and consonant chords will create a pleasant feeling in our auditory system.
For most listeners, harmony would be the main indicators that we use to determine the quality of a song.