What is across-sectional study? What is acase-control study? Which is the superior observationalstudy? Why?

What is across-sectional study? Choose the correct answer below.

A.

Cross-sectional studies first identify a group of individuals to participate in the study. These individuals are then observed over a period of time. Over this period oftime, characteristics about the individual are recorded.

B.

Cross-sectional studies are a list of all individuals in a population along with certain characteristics of each individual.

C.

Cross-sectional studies are observational studies that collect information about individuals at a specific point in time or over a very short period of time.

D.

Cross-sectional studies are observational studies that areretrospective, meaning that they require individuals to look back in time or require the researcher to look at existing records.