The correct answer is A because creating a preemptible instance requires the --preemptible flag, and to ensure the disk contents are not deleted upon instance termination, the --no-boot-disk-auto-delete flag must be included. This setup allows the disk contents to be reused if the VM is preempted.

• Option B is incorrect due to the wrong parameter for disk retention.
• Option C is incorrect as it lacks the necessary flag to prevent disk deletion upon termination.
• Option D is incorrect because it does not specify the instance as preemptible.