which answer from A-D listed is it? Thank you

A cohort study was undertaken to examine the association between high lipid level and coronary heart disease. Participants were classified as having either a high lipid level (exposed) or a low or normal lipid level (unexposed). Because age is associated with both lipid level and risk of heart disease, age was considered a potential confounder, and the age of each subject was recorded. The following data describes the study participants: Developed CHD No CHD EXPOSED (High lipid level) young 20 3980 old 200 5800 UNEXPOSED (Low or normal lipid level) young 18 6982 old 65 2935 Calculate the appropriate crude ratio measure of association by combining the data for young and old individuals. Hint: You will have to combine the two tables, young and old based on exposures so that you create the standard 2x2 table with exposed and nonexposed rows. C a. OR=2.65 b. RR= 2.65 c. OR=2.69 d. RR=2.69 1. For the same cohort study, perform a stratified analysis and calculate the appropriate stratum-specific ratio measures of association (one for young, one for old). What measure reflects the risk in older people? a. OR=2.0 C b. RR=2.0 C c. OR=1.5 C d. RR=1.5 1. What measure reflects the risk in younger people? C a. OR=2.0 b. OR=1.5 C C. RR=2.0 d. RR=15