In a Study of Korean Migrants to the United States,the

In a study of Korean migrants to the United States,the following standardized mortality ratios (SMRs) were found for disease X.What is the most reasonable conclusion to be drawn from these data? Use the table below to answer the question. Standardized Mortality Ratios by Migrant History
$$\begin{array} { | l | l | } \hline \text { Group } & \text { SMR } \\\hline \text { Native Korean living in Korea } & 219 \\\hline \begin{array} { l } \text { Korean migrants who left the country at age } \\> 30\end{array} & 214 \\\hline \begin{array} { l } \text { Korean migrants who left the country at age } \\< 15\end{array} & 115 \\\hline \text { Children of Korean ancestry } & 109 \\\hline \text { United States whites } & 104 \\\hline\end{array}$$

A) Environmental factors are unimportant in the etiology of disease X.
B) The data suggest potentially important genetic components.
C) Environmental factors exposed between age 15 and 30 are associated with disease X.
D) Migrants are highly representative of the population in their native country.
E) Age at the migration is not related with disease X.