To get rid of communism, Prevent anyone from speaking against US leaders, and to get rid of immigrants.
The answer is C it is the one that makes the most same so wild guess that it is c
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The correct answer should be the third one you listed. The "current drag" then is a device that is used in order to measure the sub-surface currents. This device and the measurements it provides are extremely important for the field of oceanography which studies the aspects of the oceans both the physical and the biological ones.
