What Does the Period Known as the "Era of Good

What does the period known as the "Era of Good Feelings" indicate about American politics in the nineteenth century?

A) Andrew Jackson's spoils system became a rallying cry for political reformers.
B) Single-party rule did not result in the easing of sectional rivalries.
C) The War of 1812 had created political tensions that were unresolved thirty years later.
D) The Monroe Doctrine was successful in creating short-term harmony between Europe and the Western Hemisphere.
E) The issue of slavery had ceased to be a central cause of tension within the American political system.