Final answer:
John A. MacDonald wanted a Legislative Union to centralize political power, underpinning a strong and united Canada. Therefore correct option is C
Step-by-step explanation:
John A. MacDonald wanted a Legislative Union in order to centralize political power. This desire was driven by MacDonald's understanding that a centralized government could more effectively manage the economy, defense, and policy-making than a collection of disparate provinces and territories. MacDonald's vision was to create a strong, united Canada that could resist external threats and internal conflicts, thereby achieving a more perfect union, much like the objectives outlined in the preamble of the United States Constitution to 'form a more perfect union' and ensure the general welfare.
The choice among options given in the question aligns with the centralization of power rather than promoting economic equality, strengthening the monarchy, or enhancing individual liberties. MacDonald's approach was not about enhancing individual rights as much as creating a powerful and coherent nation-state.