A proprietary colony was ruled by individuals who had received a land grant from the King. Delaware, Maryland and Pennsylvania were proprietary colonies.
A proprietary colony is a type of English colony in which single proprietor gets a land grant by the King. The proprietor was responsible for governing the colony and was typically given a large degree of autonomy.
Proprietary colonies were relatively rare; the majority of English colonies were royal colonies, in which the King directly controlled the government. Proprietary colonies were typically established in North America, and the best-known example is the colony of Maryland.
Hence, the correct answer is option "A".
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