Question

______ was not a main cause of world war i.
a militarism
b imperialism
c nationalism

Explanation:

The main causes of World War I include militarism (building up military strength), imperialism (competing for colonies and resources), and nationalism (strong national pride and rivalries). If we assume the options are about these causes, and if one of the options (like maybe "Immigration" if that's what option B is, though the text is a bit unclear) is not a main cause. Typically, militarism, imperialism, and nationalism (along with alliances and the assassination of Archduke Franz Ferdinand) were main causes. So if option B is something like immigration, it was not a main cause of WWI.

Answer:

Assuming the options are A. Militarism, B. Immigration, C. Nationalism (or similar relevant terms), the answer is B. Immigration (or the option that is not a main cause, based on the actual option text which is a bit unclear but following the logic of WWI causes). If the options are as per typical WWI cause questions, the non - cause option (e.g., if B is Immigration) would be the answer.