Final answer:
The student should proceed by conducting a behavioral assessment to evaluate Howard's challenging behavior and social difficulties, which may indicate Autism Spectrum Disorder (ASD).
Step-by-step explanation:
A characteristic symptom of Autism Spectrum Disorder (ASD) is impaired social skills. Children with ASD may have difficulty making and maintaining eye contact, reading social cues, and feeling empathy for others. They may also engage in repetitive motor behaviors, such as rocking back and forth, and have a preoccupation with specific subjects or rituals. In Howard's case, he exhibits impaired social skills, repetitive motor behaviors, strict adherence to certain rituals, and a preoccupation with DVDs. These symptoms are consistent with ASD.
Given his symptoms, the appropriate course of action would be to conduct a behavioral assessment (option a) to further evaluate his challenging behavior and social difficulties. This assessment would help determine if Howard meets the criteria for an ASD diagnosis and identify areas where interventions can be implemented to support his development.