The answer is furtively. Furtively means "in a way that attempts to avoid notice or attention; secretively." Brazenly means "in a bold and shameless way." Overtly means "without concealment or secrecy; openly." Hopefully means "in a hopeful manner." Eagerly means "used to emphasize a strong desire to do or have something."
To start I will be sticking out A, D, and E. Now, brazenly means in a shameless way while furtively means secretive. The best answer is C, furtively. Seeing as though being shameless doing this does not make sense. So furtive must be the answer since it would be a secret. Also, magicians never give away their secrets so it just makes sense.