The question works well to answer the question "what sources of emergency financing do you have access to?" It's less well-structured to answer "could you pay for an emergency expense without either selling off nonfinancial assets or incurring long-term usurious debt".
Since multiple selections apply, adding percentages isn't applicable. Though 50% of respondents do mention paying with current cash savings --- that could apply to all or part of an expense.
I do read "unable" and "by selling something" as mutually exclusive, which suggests a 20% portion of the population at least who'd be severely stressed by such an incident.
Even 14% is much higher than I would wish for answers to this sort of question, of course.
Anyway, if I had to read the tea leaves I would guess the "real" number is somewhere in the ~30% range based on EF5A and EF5B (EF5B was only asked if the respondent answered they would pay all bills in full for EF5A). That is, 22% of the respondents are having trouble paying existing bills in full (though what that means is another complex question, I bet) and another 11% (14% of 78%) would have trouble doing it if they had an unexpected $400 expense. That gets us to 33%; some of those might be able to recover from the $400 expense over the course of a month or three by temporarily running a small credit card balance and then paying it off, but it's not going to be too many I expect.
Which is pretty horrible. Not 47% horrible, but horrible.