Which option identifies the type of study described in the following scenario? A group of 50 men are being studied. Of those men, 25 have heart disease and 25 do not. The groups of men are as similar as possible in every other way: race, diet, socioeconomic status, marital status, etc. The researchers are trying to determine what caused the 25 men to develop heart disease when 25 other men did not. They ask the men a lot of questions about their life and experiences to try to determine what could have caused these differences. Prospective cohort study Randomized controlled trial Historical cohort study Case study