Answer:
a is 1.
b. is 2.
and c is 3.
BTW, this is not a guess.
The answer should be B) Bronze age or the second option.
The enactment of the Clean Air Act of 1970 (1970 CAA) resulted in a major shift in the federal government's role in air pollution control. This legislation authorized the development of comprehensive federal and state regulations to limit emissions from both stationary (industrial) sources and mobile sources.
He asked the Roman Catholic Church for help
This was possible for him because he was the holy roman emperor, and when he managed to beat the nobles, he also managed to increase his power through his control of the clergy, so he became the most important person in the country on numerous basis, both as a religious leader and as an emperor of the lands.
