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Like Bev Parks and others, my preference would be none of
the above. Instead, I'd write "Answers to Review Questions"
to avoid the strings of three nouns in Sunny's choices, two
of which happen to function as modifiers. Noun strings like
these slow down user comprehension because the user has to
figure out the syntax. It's especially important for the
syntax to be obvious in a heading that users will tend to
skim anyway.