[Expert Solution]: A cross-sectional study finds that persons…

A cross-sectional study finds that persons younger than 70 years of age have a higher prevalence of pneumonia than those 70 and older. Which of the following is the best explanation for this observation? Group of answer choices a. Persons younger than 70 have a higher incidence of pneumonia b. Persons younger than 70 have a higher case-fatality rate for pneumonia c. Persons younger than 70 are more likely to have complete follow-up in pneumonia studies d. Persons 70 and older have a shorter duration of pneumonia compared to those younger than 70