What are two reasons that could cause this issue?

An administrator is attempting to deploy a Change Set from a development org to a test org but the test org is not available in the list of target organizations.

What are two reasons that could cause this issue?
A . The components in the Change set could not be found within the test org
B . Change Sets can only be deployed from a sandbox org to a production org, not another sandbox org.
C . The development org has not been approved to upload Change Sets from within the test org
D . The development org and test org are not associated with the same production org.

Answer: CD

Explanation:

Two reasons that could cause the issue of not being able to deploy a Change Set from a development org to a test org are:

The development org has not been approved to upload Change Sets from within the test org. To deploy Change Sets between two sandbox orgs, the administrator needs to establish a deployment connection between them. A deployment connection allows one org to send outbound Change Sets and another org to receive inbound Change Sets. The administrator can create a deployment connection request from the development org and approve it from the test org.

The development org and test org are not associated with the same production org. To deploy Change Sets between two sandbox orgs, they must be linked to the same production org. A production org is an org that contains live data and business processes. A sandbox org is a copy of a production org that is used for development, testing, or training purposes. Sandbox orgs inherit the deployment connections of their source production orgs.

Reference: Deploy Using Change Sets, Deploy a Change Set