Final answer:
The child's confusion is most likely due to a limited understanding of the role of pragmatics in interpreting meaning.
Step-by-step explanation:
The child's confusion is most likely due to a limited understanding of the role of pragmatics in interpreting meaning. Pragmatics refers to the social rules that guide language use and understanding in different contexts. In this case, the child may not yet understand that his father's comment is sarcastic and meant to convey the opposite meaning of what was said. This could be because the child has not yet encountered or learned the definition of the term 'sarcasm.'