Ocean currents can be caused by wind, density differences in water masses caused by temperature and salinity variations, gravity, and events such as earthquakes or storms. Currents are cohesive streams of sea water that circulate through the ocean.
(Always willing to give a helping hand)
I think your answer is D.) Labor Unions although if this is incorrect please let me know so I can research more on the subject.
The goal was to persuade the States that the time had come to declare their independence from Mother England for the United Colonies.