Answer:
An alpha test group is made up of people associated with the project, but a beta test group is made up of people from outside the organization.
Explanation:
Based on the options you've presented, this one makes the most sense. Why? The Alpha Testing Phase of a project is those working with the earliest builds of the project. During this stage the project is bare bones, there's no meat.
By the time the Beta phase is reached, the team is ready to branch out of its inner circle and invite others to come help test it out. The Alpha stage they put the bones together and in the Beta stage their starting to put meat on it.