The correct answer is Only a subset of data in existing system fields from the team managed project will carry over.

When you move issues from a team managed project into an organization managed project only certain system fields and issue data are preserved by default. Basic fields like summary and description and attachments and comments commonly move, but many system values depend on the target project's workflows, statuses, and configurations so they may require mapping or may change during the move. For that reason Only a subset of data in existing system fields from the team managed project will carry over accurately reflects typical migration behavior.

Issue keys will remain the same after migration is incorrect because an issue key includes the project key and moving an issue to a different project normally changes its key.

All values from custom fields created in the team managed project will be preserved is incorrect because custom fields can be project specific and may not exist or may have different contexts in the target project so values can be lost or become unavailable if there is no matching custom field.

Every value in the standard system fields from the team managed project will remain intact is incorrect because many standard fields depend on project specific workflows and configurations and therefore do not always remain exactly the same after migration.

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