Severe intellectual disability is the intellectual disability in which a person's IQ ranges from 20 to 34.The person face an abnormal developmental of central nervous system which slows down and impairs the motor working, communication understanding, logical thinking, memory issue etc. The person requires guidance and someone to observe their working.
According to the question,Mel is facing severe intellectual disability because he requires observation and checking the conditions of his works even though he can give himself self care.
Other options are incorrect because mild intellectual disability, moderate intellectual disability or profound intellectual disability does not cause high damage to central nervous system and impair the motor working of human.
