Plz, help me with the question below.

Identify the example of when situation and time are key to assessing risk of harm in a research study: a study on the efficacy of a behavioral intervention for smoking cessation involves both adults and teenagersasking women if they have had an abortionresearch on the prevalence of hiv-infected individuals in communitiesa survey about sexually transmitted diseases

Brainliest to who answers! what will always cause a supply curve to shift to the left?

What important race leader of the early twentieth century is being described?