What Was a Reason for the Rise of the Republican

What was a reason for the rise of the Republican Party?

A) The issue of slavery split the second party system.
B) Southerners were demanding a more conservative party in American politics.
C) Business leaders wanted a party to represent their interests.
D) Some political leaders opposed progressive reforms that had recently become law.
E) The Whigs were corrupt and were blamed by the public for the spoils system.