Final answer:
Considering Gerry's functional vocabulary skills, difficulties with social interaction, and inflexible behaviors, he falls into Level 1 severity of autism, which requires support.
Step-by-step explanation:
The severity of autism spectrum disorder (ASD) varies significantly among individuals. Given the details provided about Gerry, who has functional vocabulary skills but difficulties with social interaction and inflexible behaviors, he likely falls into Level 1 severity of autism, according to the DSM-5 criteria. This level is defined by requiring support for social communication and may exhibit inflexible behavior that interferes with functioning. These criteria seem to match Gerry’s characteristics as described. Thus, the appropriate answer to the question “Gerry's severity of autism is level # ________?” would be “3) 1”.