Use the Types of Observational Studies flow chart interactive to answer the following question. A sociologist conducts a study of the number of single parents between the years of 2000 and 2015. What type of study is that? Choose the correct answer below. A. Cross-sectional B. Prospective C. Retrospective D. None of the above

The study described involves analyzing data on the number of single parents over a period spanning from the year 2000 to 2015. Here's how the options break down: - **A. Cross-sectional:** This type of study examines data at a single point in time, rather than over an extended period. - **B. Prospective:** This involves following subjects forward in time from the present into the future. - **C. Retrospective:** This type of study looks back at existing data over a specified period in the past. - **D. None of the above:** This would apply if none of the other options fit the study, which is not the case here. Since the study analyzes data from the past (2000 to 2015), it **retrospectively** examines existing information. **Answer:** C. Retrospective