Final answer:
Children typically understand common opposites between the ages of 24-36 months, as their language skills and cognitive abilities develop to support this understanding.
Step-by-step explanation:
It is most typical for children to understand common opposites such as big/little, hot/cold, and similar concepts between 24-36 months of age, corresponding to answer option (d). Cognitive milestones during early child development indicate a progression in understanding opposites and associating correct meanings with different terms. Around 18-24 months, children start putting together two-word sentences and engage with simple commands and gestures, laying the groundwork for grasping more complex ideas such as opposites. By 24-36 months, toddlers can speak in short sentences, ask questions, and have a greater command of language, which facilitates the understanding of opposites.