Answer: B) dissociative identity disorder.
Explanation: dissociative identity disorder is an identity disturbance where individuals takes up or exhibit two or more different personality state (different behaviors). Health specialist linked this disorder to a response towards trauma as affected individuals tries to leave behind or escape bad memories.
Jake takes up or exhibit different personalities i.e different behaviors, and speaks with different voices, claiming to be someone different and in the next moment everything returnd to normalcy. This scenario shows that Jack is most likely suffering from a dissociative identity disorder.