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.
Capitalism falls under market economic system.
Red scarce I think I'm not very sure but if you think I'm wrong try
solving it with what you are most confident with.
