Caused by pressure from a large-scale geological event
a. regional
b. contact
c. dynamic

I think the one that caused by pressure from a large-scale geological event is :  A. Regional
Regional metamorphism covers a large area of continental crust including several mountain ranges and tectonic plates

hope this helps

Is there a picture of the diagram?

Explosive eruptions are the most hazardous, involving large volumes of tephra and gases emitted from the volcano. lahars, pyroclastic flows, ashfall, and many other volcanic hazards are commonly associated with explosive eruptions. explosive eruptions are very dangerous. basically, any form of hazard can occur.