A: Your VMs should use managed disks if you want to move them to an Availability Zone by using Site Recovery.
C: When you create a VM for an Availability Zone, Under Settings > High availability, select one of the numbered zones from the Availability zone dropdown.
Reference:
https://docs.microsoft.com/en-us/azure/site-recovery/move-azure-vms-avset-azone
https://docs.microsoft.com/en-us/azure/virtual-machines/windows/create-portal-availability-zone