Children with profound intellectual disabilities are most likely to:

Children with profound intellectual disabilities commonly demonstrate abilities and behaviors that are more consistent with those of infants. This is due to the significant limitations in cognitive functioning that characterize this condition. Individuals with profound intellectual disabilities often have an IQ score below 20, which correlates with severe impairments in their ability to reason, problem-solve, and communicate.

As a result, their developmental milestones are typically delayed, leading to the manifestation of skills that align with much younger developmental stages. They may exhibit basic reflexes and attachment behaviors, akin to those seen in infants, rather than developing age-appropriate skills. This can include difficulties with basic motor skills, communication, and self-care activities.

In contrast, children with average IQ scores tend to perform at a level consistent with their age, while those who display advanced skills are not likely to be classified under profound intellectual disability. Additionally, performing learning tasks at a faster rate does not accurately state the typical capabilities associated with this population, as they often require more time and support to engage in learning activities. Thus, the answer highlighting the demonstration of infantile abilities and behaviors accurately reflects the characteristics of children with profound intellectual disabilities.