Answer:
Option D, They have achieved a level of hierarchical organization greater than the individual.
Step-by-step explanation:
Insects such as termites , ants , bees and all other organisms that perform an activity efficiently while working in group are called super-organism. Such organisms are referred to as eusocial as they live in a social unit. They perform their task with marvelous excellence in a hierarchical order when channeled though proper division of labor.
Such organism cannot survive individually and hence, it is necessary for them to stay in groups.
Hence, option D is correct.