Which of the following is an example of the use of a hypothesis? a. A belief that the Covid economic-growth/health-wellbeing trade off exists and gathering supporting information. b. Expressing an opinion that the economic-growth/health-wellbeing tradeoff should not influence policy. c. Arguing that protecting the population from the coronavirus is more important than the economy. d. Testing the economic-growth/health-wellbeing tradeoff to see if it is consistent with available information.