Final answer:
The federal government increasingly governs the area of environmental law due to overlapping federal and state interests and the complex nature of issues such as immigration, health, and welfare.
Step-by-step explanation:
The federal government increasingly governs the area of environmental law. While property law, contract law, and domestic matters have traditionally been within the state's domain, environmental law has seen increased federal involvement.
Factors like the broad interpretation of the commerce clause and contemporary challenges have led to more shared and overlapping powers, encompassing health, safety, income security, education, and welfare. Issues like immigration have also highlighted the shifting landscape of federal and state roles, with both levels of government now playing roles in policy areas that were once clearly divided.
The federal government increasingly governs immigration alongside the states. While the Constitution gives the federal government the power to handle immigration and naturalization, several states have implemented their own immigration-based policies. This has resulted in a contentious issue regarding federal and state powers in immigration matters.
Therefore answer is A. Environmental law.