The correct answer would be C.Isolationism
Just 3 reasons? ok then, they were unprepared for the desert climate, they had a poor reputation with the locals, and they were considered "devils" so no one wanted anything to do with them.
Capitalists created the economic force that drove the revolution while the inventors created new technology that made it it easier to create products and make more money which in turn helped the capitalists.
Do you mean in the Soviet flag? If so here is your answer.
Answer: Communist symbol, hammer for industrial labors, and the sickle stands for the peasantry.