Use the Following Information for Questions

Multiple Choice

Use the following information for questions:
In a report by ABC News, the headlines read "City Living Increases Men's Death Risk" The headlines were based on a study of 3,617 adults who lived in the United States and were more than 25 years old. One researcher said, "Elevated levels of tumor deaths suggest the influence of physical, chemical and biological exposures in urban areas… Living in cities also involves potentially stressful levels of noise, sensory stimulation and overload, interpersonal relations and conflict, and vigilance against hazards ranging from crime to accidents."
-What type of study was this?

A) A randomized study
B) A case-control study
C) An observational study
D) A matched-pairs designed study