Marty is moody, manipulative, unstable, lacks a clear sense of identity, and often clings to others. he wants to have close relationships but is unable to do so because he is untrusting of others. marty is suffering from personality disorder. (1 point)

The correct answer in the blank is known as borderline.

Borderline personality disorder or also known as BPD, is also referred to as the Emotionally Unstable Personality Disorder or EUPD. Borderline Personality Disorder refers to the emotional instability of a person and behavioral instability that causes short-term relationships with others and misunderstood behavior.

It's most likely choice a, it makes the most sense in my opinion.