During the Jacksonian Era of the Early Nineteenth Century, a States

During the Jacksonian era of the early nineteenth century, a states' rights coalition developed, because:

A) powerful southern state representatives focused on protecting the institution of slavery.
B) the coalition included party leaders who had themselves appointed to the Senate, and staunchly protected state power.
C) a series of Supreme Court rulings that strengthened the national government led to a backlash.
D) states still developed most of the public policies that affected the lives of American citizens.