Correct Option: C

devious (Adjective) : behaving in a dishonest or indirect way, or tricking people ; deceitful
candid (Adjective) : saying what you think openly and honestly ; not hiding your thoughts
outspoken (Adjective) : saying exactly what you think ; blunt
frank (Adjective) : honest and direct in what you say
disguised (Adjective) : having its true character concealed with the intent of misleading