Which Best Describes the Recent History of Environmental Policymaking in the United

Which best describes the recent history of environmental policymaking in the United States?

A) not much activity until the mid-1980s followed by a period of significant policymaking activity that continues today
B) much policymaking activity in the late 1960s through 1970s followed by a long period of gridlock and incremental changes
C) period of incremental policy change followed by numerous significant policies enacted in the 1990s
D) period of incremental policy change followed by high level of regulation