Answer:
B) borderline personality disorder.
Explanation:
Borderline Personality Disorder, BPD can be seen as a serious mental illness which is majorly characterized by pervasive instability in moods, interpersonal relationships, self-image, and behavior.
It's symptoms includes impulsive
intense bouts of mood for short period of time, self-injury, impulsive
view themselves as bad and unworthy, may avoid being alone, etc.
Anyone with the following impulsive behavious are often regarded as having BPD, excessive shopping, binge eating, risky sex.
Any other behaviour that involves being impulsive and proves to have a negative effect in someone's health or income is considered to be BPD.
Kelvin is more likely suffering from BPD, considering his impulsive behaviour of excessive gambling, which has proven to be affecting his income and stability.