How was repression of opposition after Nazi power consolidation linked with centralisation of power?

By removing opposition the Nazi Party kept decision making power in its own hands

Option A is correct because repression removed the institutions and groups that could limit Nazi authority. Opposition parties were banned or forced to dissolve, trade unions were replaced by Nazi-controlled organisations, and political critics faced arrest, intimidation, or concentration camps. With alternatives eliminated, decisions could be made by Hitler and the Nazi leadership rather than through open parliamentary competition. This is the governing concept of centralisation: authority and decision-making move from several independent bodies to one ruling organisation. Options B, C, and D describe the reverse of Nazi practice, since opposition was not expanded, given office, or allowed an independent parliament.

This is a Class 9 History question. Chapter: Nazism and the Rise of Hitler. Topic: Hitler’s Rise to Power.