Yeah, that "failed to start fdm service" points right at A. If the service was just missing (like B), you'd usually get a different error about not finding the VIB. Seen similar messages in practice labs. Pretty confident it's A but open if someone found otherwise.
Seen this edge case before, and if the vmware-fdm service is just disabled (not missing), you'll get exactly that "failed to start fdm service" error. If the VIB was missing, you'd usually see a different message. Pretty sure it's A in this wording-let me know if you disagree.
I really think it's A here. When the fdm service is just disabled, you'll hit the "failed to start fdm" error as described-if the VIB was missing like in B, you'd get an install or package missing message instead. I've seen similar questions trip people up by making B sound tempting. Pretty sure about A, but let me know if there's a VMware version that behaves differently.