Answer: A) Formal sanction
Step-by-step explanation:
Formal sanction is the legal action that is taken by the official department and force against any party or person.It has the official approval for conducting the action against someone in terms of law. It constitutes rewards as well as punishments through law enforcement officials.
According to the question,Clyde is legally enforced to get imprisoned for the criminal activity of visual terrorism .This depicts the formal sanction of legal action against Clyde.
Other options are incorrect because norm is standards,informal sanction does not approve legal action and value is importance of something.Thus, the correct option is option(A).