Answer:
Topical order.
Step-by-step explanation:
'Topic Order' is demonstrated as the speech pattern or technique of organizing the speech by splitting the central idea of the speech into insightful sub-points in a logical yet steady manner.
As per the question, the basic speech pattern employed here exemplify 'topical order' as the key topic(central idea) has been divided into a number of logical sub-topics like 'the role of scientists', 'the role of government', and 'the role of the public' that proposes a consistency and organizational order to the speech. Thus, 'topical order' is the correct answer.