Concept:Collective responsibility means members of a government body are jointly accountable for its decisions.
Explanation:In a cabinet system, all ministers share responsibility for government policies.
In an executive system, the executive is accountable as a group to the legislature.
In a communalism system, group decisions and shared responsibility are emphasised.
However, a non-centralised system spreads power among local units and lacks a central authority that can exercise collective responsibility.
Therefore, it does not practice collective responsibility.
Answer:B. Non-centralised system