How did European Imperialism in Africa benefit the European nations who participated in the Scramble for Africa?

*
1 point
a.European nations were able to charge fees for land usage to the African farmers
b.European nations extracted important natural resources from the land
c.European nations could freely use African land to transport their trade goods
d.European nations were able to set up sea trade ports for goods from the Caribbean

b.European nations extracted important natural resources from the land