Final answer:
All three children show behaviors consistent with autism spectrum disorder: Kim has unusual sensory interests, Len shows social withdrawal, and Matt requires constant physical contact.
Step-by-step explanation:
The question asks which of the three children diagnosed with autism spectrum disorder (ASD) exhibits symptoms that are common in the disorder. All three children, Kim, Len, and Matt, show behaviors that can be associated with ASD. Kim prefers the sound of a machine buzzing over her mother's voice, which can reflect unusual sensory interests or challenges with auditory processing. Len wishes to be alone, demonstrating potential social withdrawal, a common symptom in ASD. Matt's need for constant physical contact may represent a desire for sensory input or difficulty communicating emotional needs, also seen in individuals with ASD. Therefore, the correct answer is 4) All of the above.