The coastal state of Louiseville boasts of an average life expectancy

The coastal state of Louiseville boasts of an average life expectancy of 77 years which is significantly higher than that of the hinterland state of Missouville, a state which is a predominantly agrarian economy. The environmental and external health factors positively affecting the human life-span are found in great abundance in the coastal areas. Therefore, if a newly married couple want to start their family with the hope that their offspring have a longer life-expectancy, they should prefer Louiseville to Missouville.

Which of the following most seriously weakens the argument?

A. A person's life span is usually determined by the combined impact of shared genetics and environmental factors.

B. Currently an agrarian economy, Louiseville is on its way to fast becoming an industrial state with all the side-effects of industrialization that negatively impact the mentioned environmental factors.

C. Children born outside Missouville to couples originally from Missouville have displayed no difference in life-span from the children born in Missouville.

D. A few of the children to people originally from Louiseville but who moved out before their children were born, displayed a significantly longer life span than some of the children to couples who stayed within Louiseville.

E. Migrating poses serious economic problems for couples who are setting up homes and starting families away from their native place.