I can't answer this survey. For one, it is only appropriate for American respondants. And another the choices I would give aren't there.
My level of familiarity with firearms is:
I am ignorant of how they function.
I know the basics of gun safety.
I carry for self-defense, compete or hunt.
I am an firearms instructor.
I know how guns function from watching TV.
I would answer something like "I know how firearms function from my time in the Canadian Reserves."
Given a choice, I would prefer to defend myself with...
my bare hands
an ineffective weapon, such as pepper spray
an effective weapon, such as a firearm
Clearly this survey is biased.