The Economist article, Left in the Lurch, notes that throughout history many places that have experienced economic hardships have seen their residents leave. But, it notes that such "mobility" by workers from such places is _______ in the U.S. today. Part of this dynamic reflects policies that ______ population growth in more thriving communities (and thus make it more difficult for workers to relocate). Another part of this dynamic reflects public policies that often ______ the incentive to move. Choose the correct combination from the choices below. a. decreasing; enhance; increase b. increasing; restrict; reduce c. decreasing; restrict; reduce d. increasing; enhance; reduce