The answer is letter A. The Clear Air Act would be a reason for the Environmental Protection Agency or EPA to regulate car emissions. EPA sets the emission standards under the said rule or regulation and this also covers the green house gas emissions.
I believe the answer is Paul Tillich
According to Tillich, humans are creatures that would always experience concerns from various aspects of our live (money, relationship, etc)
He believed that religion is a form of ultimate concern because it requires you to do total surrender to an entity that you've never met before.