Hughes and Cain (2011) suggest that an event or series of events occur

Hughes and Cain (2011) suggest that an event or series of events occurring in 1763 doomed British policy. What happened?

(a) A series of oppressive taxes
(b) A tightening and more rigorous enforcement of the Navigation Acts
(c) A proclamation which limited trans-Appalachian settlement to lands once granted to colonists
by crown approval
(d) An act that gave the Quebec province all the land west of the Ohio River

ANSWER

(c)