A(n) is a situation that could not be predicted and must be dealt with immediately because it is dangerous or may become dangerous.

The unpredicted situations should be controlled immediately as it can be harmful or dangerous if delayed.

Explanation:

Scientific research works may sometimes predict certain phenomenon though it may or may not be accurate every time. However, a wrong prediction can result in dangerous natural incidents.  This problem can be a reason of lack of knowledge or complexity of situation. We should only depend on probabilities then.

This increases the risks in handling such situations. However, certain steps should be taken immediately after the occurrence of the disaster and some basic preparations should always be present in order to fight the wrath of nature.  

i would definitly say b : )