Option b is correct. The Proclamation of 1763 forbade American colonists from moving west of Appalachia in order to stabilize the imperial economy.
The Proclamation of 1763 was issued by the British at the end of the French and Indian War to appease Native Americans by checking the encroachment of European settlers on their lands. It created a boundary, known as the proclamation line, separating the British colonies on the Atlantic coast from American Indian lands west of the Appalachian Mountains. In the centuries since the proclamation, it has become one of the cornerstones of Native American law in the United States and Canada.
Among the given options, b is correct that is the main purpose was to stabilize and prohibit the American colonists from properly settling in west of Appalachia.
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