Answer:
The correct option is d) someone with savant syndrome.
Step-by-step explanation:
Savant syndrome can be described as a condition in which a person who has mental disabilities is seen to be excellent or above average in certain other activities. Generally,people with savant syndrome have known to have excellent memory. For example, such people can be excellent in calculation or music abilities.
As the scenario in the question depicts, Alexandra is mentally handicapped but excellent in music abilities. Hence, she is having savant syndrome.