The correct answer to this open question is the following.
Although there are no options attached, we can say the following.
According to Jody Freeman, some of the reasons why the federal government should intervene with national standards to regulate fracking, are the following.
She, as the expert on environmental issues she is, says that the federal government is better equipped to regulate the use of fracking in the United States. The main argument is that fracking is a controversial practice to extract oil and gas because it damages the environment. The states are not in a position to better manage this issue, alone. She considers that the risks of fracking can go beyond state limits and could become a national interest.
Jody Freeman is a renowned professor of Harvard School of Law that specializes in environmental law.