An illustration shows you exactly what the book is trying to portray by using pictures or descriptive text. An illusion can be used to deceive someone or something into making it look like it is something else.
The recent news reports on the radio weren't very informative.
Your answer is A: weren't
The action takes place in and around an old castle, sometimes
seemingly abandoned, sometimes occupied. The castle often contains secret passages,
trap doors, secret rooms, dark or hidden staircases, and possibly ruined sections. The
castle may be near or connected to caves, which lend their own haunting flavor with
their branches, claustrophobia, and mystery. (Translated into modern filmmaking, the
setting might be in an old house or mansion--or even a new house—where unusual
camera angles, sustained close ups during movement, and darkness or shadows create
the same sense of claustrophobia and entrapment.)
