The desire to take over lands for one's own country is called
a. imperialism.
b. patriotism.
c. militarism.
d. nationalism.

I understand from the question  that it's not own lands that the country is taking over,  but other, new lands, potentially already occupied by other lands.

This is then imperialism- the will to built an empire (such as the British Empire), that is, have more land under control.

Ithink that it is d