It would depend on the country itself, of course, as they deal with the issue differently, but in general:
a) Security movement is tightly regulated, so even peer-to-peer trading may be scrutinized
b) Miners may be considered as a "security issuer", so they will need to register themselves, and their sales would have to be tightly regulated
c) Selling Bitcoins may require even individuals with small amounts to have permits
Still, I imagine each case will have to be looked at individually, so the smaller players may not be affected at all, not to mention that it's likely impossible to track every single transaction. We'll see, I guess.
I don't think miners will be regarded as a security issue. Remember, they don't send any transactions at all, they just maintain the ledger, they are accountants.
With a), there have been a lot of scam ICOs, so there will be regulation which means ICOs will only be done for real projects
and c) would come under existing money laundering rules. So large movements will be scrutinised, but small movements not. (Because who on earth launders small amounts like $100?)