Question

the crisis - mapping tool ushahidi
a. shows that a free software product can have great value.
b. is only available in the united states
c. relies on people using their desktop computing power to help others.
d. prevents two - way dialog between people.

Explanation:

Ushahidi is an open - source (free) software. It has been used in various crisis situations around the world (not just in the US), facilitating information sharing and often enabling two - way communication. It does not rely on desktop computing power in the way distributed computing projects (like some scientific computing projects) do. The fact that it is free and has been used effectively in multiple crises (e.g., for disaster response, election monitoring etc.) shows that a free software product can have great value.

Answer:

A. shows that a free software product can have great value.