The connection of Singapore with high levels of short-sightedness is to prove that______.A

The connection of Singapore with high levels of short-sightedness is to prove that______.

A．genetic factors play a more important role

B．environmental factors play a big role

C．both genetic factors and environment do harm to people

D．both genetic factors and environment have something to do with short-sightedness

请帮忙给出正确答案和分析，谢谢！