<span>They </span>became more aware by
college discussion and discourse.
SDS which stands for Students for a Democratic Society was an
activist group of students in the United States that was one of the primary
portrayals of the New Left. The association created and extended quickly in the
mid-ninety sixties preceding dissolving at its last tradition in 1969.
In most urban areas, it is very common that there is a lot of pollution as a result of all the cars and pollutant producing things like vehicles. Thus making it quite a problem as it can have many health implications (if on a large scaled (see cities like China where people have had to wear masks to prevent any toxication)). Pollution also contributes to global warming which is an ongoing issue that affects the entire world.
I'm pretty sure the answer is A
