Question

international governmental organizations
have a \home base\ in the country most in need of help.
are able to operate in every country that is part of the group.
send workers out from a singular location in a national capital.
allow struggling citizens to seek refuge in their headquarters.

Explanation:

International governmental organizations are set - up to operate among member countries. Their nature allows them to function in every country that is part of the group. They don't necessarily have a home - base in the country most in need of help. They don't always send workers from a single location in a national capital and they are not for providing refuge in their headquarters for struggling citizens.

Answer:

are able to operate in every country that is part of the group.