The Question: What were these Dutch windmills used for?
A Pumping water
B Generating electricity
C Grinding grain
Beginning in the 1700s, the Kinderdijk windmills were frontline defense, pumping water off the reclaimed land in a constant territorial battle with the sea. Some of the windmills are still operational, but the main water works today are provided by diesel pumping stations.
The correct answer is Pumping water.