According to some political and legal researchers, why can competitive federalism create a "race to the bottom"?

Competitive federalism create a "race to the bottom" because "competition for jobs can result in the elimination of some environmental regulations."

Explanation:

Federalism is a kind of administration in which the authority is separated among the national administration and other legislative units. It contrasts with a unitary administration, in which a vital expert holds the influence, and a association, in which states, for example, are obviously leading. The competitive federalism involves the competition among st the states and also the Center for the economic benefits within the economy. One aspect of competitive federalism today is that some policy issues, such as immigration and the marital rights of gays and lesbians, have been redefined as the roles that states and the federal government play in them have changed.  

even though you have attached neither the chart nor the generalizations, i have located them online. the right answer is d, since they are asking you about a generalization. you can only infer from the chart that between 2008 and 2009 the number of employed workers decreased significantly (from over 115 millions to 107 millions approximately), which signals some type of economic crisis.