Perpetually snow-capped peaks create punishing winds and temperatures close to zero even during the summer.

How is this even a question?

Well, a and b together would be negative. b alone would also be negative.

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.

This is a true statement  hope this : )