The characteristic of Jacobins is that they were extremely radical.
The Jacobins or the Jacobin club is one of the most famous political group during the era of French Revolution. They were famous because they were extremely violent towards the public.
Being extremely radical means that the Jacobins had different view points to rule the country. These views are completely different from the root up norms or regulations.
Therefore, option d) They were extremely radical is correct.
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