Mental or physiological effects are the cause of __________.
Numerous studies have linked noise pollution to increased anxiety, depression, high blood pressure, heart disease, and stroke. Even small increases in unwanted ambient sound have significant effects. In 2011, for example, scientists studying people living near seven major European airports found that's a 10 decibel increase in aircraft noise was associated with a 28 percent increase in anxiety medication use.
The correct answer is C .