Multiline headers in iOS

I'm designing an iOS app with a Q&A section, where every question is its own page. Not every question fits comfortably inside the header.

Should I:

a) put the heading text below the header bar for every question, leaving just a back arrow there

b) do a only for the questions that don't fit

c) decrease font size for those that don't fit (not a fan of this one -- decreases legibility)

d) ellipsize -- the problem there is cutting off a potentially important part of the question