People with personality disorder will display a rigid, pattern of inner experience and outward behavior that weaken their sense of self, emotional experiences, goals and capacity for intimacy.
Delusion disorder is also called paranoid disorder that is associated with nonbizarre delusions that lasts for at least one month. In this the delusions are reasonable compared to schizophrenic disorder.
The characteristics include suspecting others without any reasons, preoccupying with unjustified doubts and recurrent suspicions.
Schizoid personality disorder belongs to odd and eccentric disorders. It is characterized by
• The person neither desires nor enjoys close relationships.
• Always choose solitary activities.
• Lacks close friends
Hence the options b, c and d are not correct.
Thus schizoid personality disorder is defined as the pervasive detachment from social relationships and restricted expression of emotions in interpersonal settings.
Hence the options a, b and c are not correct.
Schizotypal personality disorder is also associated with the social detachment and unnecessary suspicions but it also includes cognitive or perceptual distortions and eccentricities of behavior.
Hence the correct option is .