These findings suggest that:
a. Environmental factors are the major determinants of these SMRs
b. Genetic factors are the major determinants of these SMRs
c. Environmental factors associated with the migrant culture are probably involved
d. Migrants are highly selected and are nonrepresentative of the population in their native country
e. International differences in coding death certificates for disease X are an important determinant of these SMRs
Answer: b. Genetic factors are the major determinants of these SMRs