C- To prevent stock market fraud
He disagreed with with the communist viewpoint so he tried to find the communist to stop the spread of communism.
This is true.
Trade-offs are based around the idea that in order to get something, we have to sacrifice something in return. A simple example would be you going to work. You earn money but you sacrifice your time in order to do it. In order for one thing to increase, another thing has to decrease in a trade-off, which means that you can't have your cake and eat it too.
