Option B here. The "Integrator" name trips people up but only Falcon Administrator has the privileges to create and manage API keys. I've seen a couple practice sets that try to trick you with D. Anyone actually used D to create keys in the console? I don't think that's possible, but open to being corrected.
Pretty sure it's B. Saw a similar question in some practice tests and the Falcon Administrator is always required for API key creation, even if "Integrator" sounds like it fits. Let me know if anyone's seen different behavior in an actual console setup.