Concept:Social insects live in organised colonies with cooperative care and division of labour.
Explanation:Social insects, like termites and honeybees, live together in well-structured colonies.
They divide work among different castes or groups within the colony.
In the given list, the insect labelled II is a termite, and the insect labelled IV is a honeybee.
Both termites and honeybees are true social insects.
Grasshoppers and butterflies, however, live independently and do not form organised colonies.
Therefore, the correct pair of social insects from the list is II and IV.
Answer:C. II and IV