Thanks, all.
I think, then, that the punctuation below is correct as well. Agreed?
The questions 'Who?', 'What?', 'When?', 'Where?', 'How?', and 'Why?' remain unanswered.
Her 'How late were you out?', 'How much did you drink?', and 'Did you cheat on me?' questions unnerved me.
Thank you.