The answer to the question is number 4: the central intelligence agency
The caste system is a system that divides Hindus into four main categories - Brahmins, Kshatriyas, Vaishyas and the Shudras. Sorta like a pyramid of food groups in health. These castes were based on peoples daily jobs/occupations. Outside of the caste system there were the untouchables or otherwise known as the "the Dalits".
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All I would know on this matter, is : America joined WWI because of the American lives being lost on Passenger liners such as the RMS Lusitania.
The correct answer is The colonists could export goods only to Britain.
When the American colonists were under the control of Great Britain, they were under the influence of a mercantilist system. This economic system was created as a means to to benefit the mother country (England) by gaining natural resources from North America and developing a favorable balance of trade. Essentially, the colonies economy existed to solely benefit the British.
This severely limited the American colonists trade with other countries. This angered colonists at different times, as they felt it was an unnecessary constraint implemented by the British government.