Answer:
(D). Disinhibition
Step-by-step explanation:
Disinhibition or online disinhibition occurs when an individual feels that due to the anonymous nature of the internet and its platforms, such as email and social media, he or she can make certain rude, harmful or aggressive comments without any consequences.
Such rude comments would not have been made if the interaction was face to face.
Other reasons for this behavior may include; low empathy for others and the feeling that communication isn't happening in real time and so there won't be an immediate reply.
Therefore Arthur's behavior illustrates disinhibition.