C is correct.
https://docs.vmware.com/en/VMware-NSX-T-Data-Center/3.0/installation/GUID-B89F5831-62E4-4841-BFE2-3F06542D5BF5.html
https://docs.vmware.com/en/VMware-NSX-T-Data-Center/3.0/installation/GUID-D225CAFC-04D4-44A7-9A09-7C365AAFCA0E.html#GUID-D225CAFC-04D4-44A7-9A09-7C365AAFCA0E
For an additional NSX manager to be installed from the NSX UI, a datastore and network are required. Only having registered a vCenter in NSX previously would allow you to select those resources, otherwise, you won't be able to configure it.
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