D - A proposed explanation for a set of observations.
Explanation:
A hypothesis, as the exercise states, is a proposed explanations for a set of observations. It means to explain a certain phenomenon, why has something worked out in the way it did. So, all in all, a hypothesis is an explanation made out of the limited evidence that means to be the starting point for further investigations or hypothesis. Every hypothesis solves a question and works to formulate another. For example, when solved that such a thing as gravity existed, a question like "why does it exist" arrived.
The Public Information Officer (PIO) is the member of the command and staff who is responsible for interfacing with other agencies to meet incident-related information requirements. These officers gather facts and distribute them to the media and produce printed and video material about their organization.
