URGENT HELP NEEDED PLEASE, ONLY ANSWER IF YOU KNOW Which topic is often used as a theme for studying 20th-century world history?

A. Human and civil rights
B. European imperialism and colonialism
C. Political and economic isolation
D. Declining interest in nationalism

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he risk-return relationship. generally, the higher the potential return of an investment, the higher the risk. there is no guarantee that you will actually get a higher return by accepting more risk. diversification enables you to reduce the risk of your portfolio without sacrificing potential returns.

explanation:

b. would be the answer if not try c

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: ) : 0 : o : d

explanation:

on november 6 and 7, 1917 (or october 24 and 25 on the julian calendar, which is why the event is often referred to as the october revolution), leftist revolutionaries led by bolshevik party leader vladimir lenin launched a nearly bloodless coup d'état against the duma's provisional government.