What was the consequence of the agreement between the National German Party and Hitler's party?

I- The agreement led to the polarization of political life.
II- The agreement led to the degradation of parliamentarism.
III- The agreement led to the radicalization of the society towards the extreme left.
IV- The agreement led to the radicalization of the society towards positions of the extreme right.
a) I and III are correct.
b) II and IV are correct.
c) I and IV are correct.