Answer:
A. train
Explanation:
Isolating an employee doesn't make much sense without context. Examining an employee wouldn't be something you'd do with an employee but I might be wrong.
This sentence is an example of an idiom
Stated
it says to improve the air quality
c.) has developed a unique musical style.
In this excerpt we see that he had been “underground” (or away from mainstream society) when he wrote his songs. Because of his asocial tendency, he was not influenced by society and was able to develop a musical style that was uniquely his own and was original because he would not even have been subconsciously influenced which made his music “pure.”
