Answer:
Safety needs
Explanation:
Maslow developed a theory based on the needs of the human beings, he proposed a hierarchy of needs that is usually represented as a pyramid.
According to Maslow, needs lower down in the hierarchy need to be satisfied in order to focus in needs that are higher up in the pyramid.
The needs he proposed are:
William has volunteered to serve a war-torn country to try to improve the lives of its residents.
If the citizens have enough to eat and drink, their physiological needs are being satisfied.
Then, according to Maslow we would need to fulfill the next group of needs in the hierarchy which corresponds to Safety needs, this is, the residents would need protection from the elements (by having a house or somewhere to live which provides security and stability).