Why Did the Conservative Bismarck Pioneer the Creation of an Expansive

Why did the conservative Bismarck pioneer the creation of an expansive system of social welfare?

A) He sought to blunt the attraction of socialism to the working classes and give them a small stake in the existing political system.
B) He sought to undermine the power of the landed aristocracy by building a political movement based on support from the masses.
C) He was compelled to offer greater social benefits so that German workers would not migrate to France and Great Britain, where such programs already existed.
D) He believed that social welfare programs were a government's moral responsibility.