Answer: (B) Dissociative Amnesia
Step-by-step explanation:
The dissociative amnesia is basically refers as disorder in which the person are not able to recall the various types of important data or some private necessary information and this information is lost only temporary from our memory.
In this type of disorder is the person suffering from the dissociative disorder and it is also known as one of the type mental illness which involve the breakdown of memory.
According to the given question, the dissociative Amnesia is best describe about the Omar's condition as he is not able to recall his childhood memory that how he reached to the discount store in the Xania town.
Therefore, Option (B) is the correct answer.