You're right on containment. The "domino" in domino theory describes what happened if communism wasn't contained in a region. So both terms should be acceptable.
It really shouldn't, you wouldn't accept FBI for the USA. It's obvious the question would want the security services that were at the forefront of the cold-war.
It should be worded a bit better I think. The MI6 and the CIA deal with foreign spying whereas the MI5 and FBI deal with internal espionage and GCHQ and NSA deal with codemaking/breaking and digital activity. That's a gross simplification but I think something along those lines should be made clear in the quiz - that it is looking for the foreign spy jobs.
I believe that MI5 serves a function more similar to the FBI or NSA. Counter-intelligence and domestic security (and spying, though domestic spying is a term people like to avoid using). They are all intelligence (spy) agencies. A more correct clue would be American/British external spy agency.
Part of the FBI is involved in countersurveillance, but that's not the main function of the FBI. So I don't think FBI fits. The NSA is also a spy agency, for sure, and there may be others in America. MI5 I think is an intelligence agency (Military intelligence division 5).
But the real British spy agencies are probably MI1 through MI4 - so secret no one knows what they do ;-)
I was pretty sure it was "glasnost," but I couldn't spell it. I tried a bunch of different ways (none of them correct)...then I tried Perestroika and that didn't work either. Bummer.
^ Don't! (Feel dumb). The way it's written, it's hard to distinguish whether it's a "1" or an "I". I thank my addiction to James Bond films for knowing that it's M I 6 and not M16.
The two terms are not the same. Glasnost = openness; Perestroika = restructuring or reforming. And a nuclear war certainly causes more than just death.
Other than NATO - the last four things are not acronyms - they are initialisations. An acronym is a word made out of initials, not just a set of initials
But the real British spy agencies are probably MI1 through MI4 - so secret no one knows what they do ;-)