The main difference between a presidential system and a parliamentary system is option B; Whether power is shared between national and regional governments.
Both the presidential and parliamentary are branches of democracies although, they are slightly different because of their structural organization.
The difference between presidential and parliamentary democracies are;
In a parliamentary, the executive and legislative branches are joined together while in a presidential, the two branches are separate.
The main difference between a presidential system and a parliamentary system is option B: Whether power is shared between national and regional governments.
Hence, Option B is correct.
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