SSH enabled on an ESXi host (Option C) can be a security concern if not properly managed, as it can provide broad access to the host.
A connected Floppy drive (Option D) can be a risk as it could be used to introduce unauthorized data or software into the VM.
Allowing Promiscuous Mode (Option F) on a Distributed Port Group can be a security risk as it allows all virtual machines connected to the port group to see all network traffic, which is generally not recommended in secure environments.