Question: The following is a main point, a subpoint, and two sub - subpoints from a preparation outline about acoustical engineering. Which is the subpoint? Multiple

The following is a main point, a subpoint, and two sub-subpoints from a preparation outline about acoustical engineering. Which is the subpoint?
Multiple Choice
Noise control is an issue both for indoor and outdoor settings.
Indoors, noise control deals with everything from electric appliances to crowd noise at sports events and concerts.
One major element in acoustical engineering is noise control.
Outdoors, noise control deals with the sounds of nature as well as with the sounds created by modern technology.

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