I chose the "Nothing....." option. I'm in my 30s but my family still don't know I'm gay. I don't know if I'll ever tell them - I have issues with the whole 'coming out' concept, but that rant is for another time.....
Anyway, the "Nothing....." comes from experience. I was a painfully shy child (and adult) so meeting other children/adults was/is a terrifying experience. I've always hated asking for help because I worry that it shows weakness and someone will take advantage of it.
Then on top of that, I have my sexuality issues - I've had to be very guarded with my thoughts and feelings and opinions ever since I was a teenager (maybe even earlier). Even if it has absolutely nothing to do with sex or sexuality, I hold back out of worry that if I let someone know one feeling, they will figure out another, then another, then another, etc.
That's why posting on here can be so difficult sometimes - I am not used to expressing and explaining myself so openly. It makes me uncomfortable so I end up just posting terrible jokes instead.
Plus my ancestry is very British - we don't do that whole 'sharing feelings' crap. We keep it all in until it gives us high-blood-pressure and a fatal stroke.
But TBH, I think it's really a trick question because if you can't feel you can be honest with someone, then maybe they are not really closest to you.