The diagram below shows the result of nationalist movements in countries such as italy and germany in the late 1800s: a cycle diagram is shown. the top of the diagram reads nationalism. an arrow moves from nationalism to the text identifying with a common history. an arrow moves from identifying with a common history to a question mark.

The correct answer should be Unification. Due to the rise in nationalism and  the establishment of the concept of common history, people in Germany and Italy were able to unite since before they were just a bunch of smaller independent kingdoms. With the rise of nationalism in the 19th century, they started forming large states based on a common history.

The answer is B! Hope this helps