Final answer:
The child is likely experiencing sensory overload due to the noisy and highly active classroom environment.
Step-by-step explanation:
The child is likely experiencing sensory overload. Sensory overload occurs when there is an excessive amount of sensory stimuli that overwhelms an individual's ability to process and respond to them. In a classroom with high activity and noise levels, the child may find it difficult to concentrate due to an overwhelming amount of sensory input.