The correct answer is C) They were not legally allowed to settle to the east of the line.
This map shows the Proclamation Line of 1763, which was created after the end of the French and Indian War. The colonists were offended by the Proclamation Line because they were not legally allowed to settle to the east of the line.
The American colonists were upset by this decision made by the British government and of course, many Americans did not follow this rule and this caused many conflicts with the English. A series of conflicts and differences due to the heavy taxation imposed by the English crown and the fact that the American colonists did not have voice or representation is the British Parliament were major causes of the American Revolutionary War.