How did the dutch extract raw materials from their colonies in the east indies?
by using the natives as cheap labor
by bringing in slaves from africa
by sending european colonists to farm the land
all of the choices are correct.

The first option is the correct answer.
The Dutch extract raw materials from their colonies in the East Indies by using the natives as cheap labor.
According to history, the Dutch exploited the colony, its natural resources and Indonesia's labor force. They are very interested in gaining profit, thus forcing  farmers to grow commercial crops for the local government and Dutch.