Alexa Started a New Job on Monday Morning

Multiple Choice

Alexa started a new job on Monday morning.For the first three days,she showed up in bright colours and was outgoing and extroverted.However,on Thursday she showed up in a dark suit and appeared shy and introverted.She insisted that her name was Clara,and she couldn't understand why her co-workers kept calling her Alexa.Which disorder is consistent with Alexa's behaviour

A)  schizophrenia 
B)  antisocial personality disorder 
C)  dissociative identity disorder 
D)  dissociative fugue