What Was the Major Reason That Europeans Drained Swamps,cut Down

What was the major reason that Europeans drained swamps,cut down forests,and reclaimed land from the sea from the 1000s to the 1200s?

A) to increase the area of arable land
B) to clear land for cities and towns
C) to create seaports and trade routes
D) to build bridges and canals
E) to dig mines and quarries