The navigable rivers in Western Europe have historically impacted economic development in the region by —

A. providing for the irrigation of arid land
B. blocking the spread of epidemic diseases
C. preventing the advancement of land armies
D. facilitating the movement of goods and people

Ithink the answer is b

Europe needs to build a trump-like wall that will spread across europe making it impossible for migrants to cross they need to spread pig guts all over this wall so the muslims will never consider crossing into europe..you might be asking "can't they just fly over with planes? " well yes they can so we will install thaad missile protections system to shoot down any aircraft that violates europe's air fourth would be to start a fourth reich in germany.. last but not least.. make europe great again!

The answer is    d.  central highlands