How can we account for a higher positive predictive value of an Osteoporosis screening test in population A compared to population B, despite using the same screening test in the same way for both populations?

A. The prevalence of the disease is lower in population A than in population B
B. The prevalence of the disease is higher in population A than in population B
C. The specificity of the test is lower in population A than in population B
D. The sensitivity of the test is higher in population A than in population B