Answer: Applying economic pressure.
Economic pressure can take form of boycott of goods and services from certain companies. In this situation, people are applying economic pressure by refusing to eat at the fast food place and picketing the fast food place on weekends in order to promote social justice.
It was the victory battle of Stranglad that lent optimism to the Nazi German troops in early 1942. Together with their allies, they were fighting against the Soviet Union for taking control Stanglad which is found in the southern part of Russia.
If it's only regarding the invention of a specific dental equipment, it'll be to inform. the student is preparing to share their knowledge on the dental drill.
to persuade is usually the purpose when there's a question or an argument being raised, and in this case, it doesn't sound like anyone would be against dental drills. dental drills is also a fairly dry topic, so it's doubtful that the student would be aiming to entertain. it isn't a demonstration because the student likely isn't giving a step by step how to in regards to using a dental drill.