What did Otto Von Bismarck do to help unify Germany?

Question

He sponsored the development of a nationalistic education focusing on the achievements of the German people.
He helped create wars with neighboring countries to increase national pride among the German people.
He pushed through laws to forbid foreign immigration to Germany in an attempt to keep the nation ethnic pure.
He created a military alliance with Austria, the most powerful German nation at the time.
A?

Answer 1

I agree with A,

Answer 2

A is not correct