The Following Questions Refer to the Excerpt Below

The following questions refer to the excerpt below.
"Whereas it is… essential to our Interest,and the Security of our Colonies,that the several Nations or Tribes of Indians ...who live under our Protection,should not be molested or disturbed ...--We do therefore,...declare it to be our Royal Will and Pleasure...for the use of the said Indians,[to be reserved] all the Lands and Territories ...lying to the Westward of the Sources of the Rivers [along the Appalachian Mountains] which fall into the Sea....And We do hereby strictly forbid… all our loving Subjects from… taking Possession of any of the Lands above reserved…"
The Royal Proclamation,King George III,October 1763
-Which of the following best explains why British colonists would have been frustrated by the Proclamation above?

A) Population growth in the British colonies led many to seek land along the frontier between British territory and traditional tribal lands.
B) Increased attempts to regulate the colonial economy led many colonists to protest British rule.
C) Nationalist desires to compete with the French drove many colonists to attempt to expand Northward.
D) Repeated Native American raids of colonial outposts led to significant hostility among British colonists towards the Native Americans.