The Proclamation Act of 1763:.
a. closed the lands west of the Allegheny Mountains to settlers
b. allowed Parliament to pass any laws
c. was the final act that angered the colonists to such an extent that they went to war d. led to the formation of the Sons of Liberty

a. closed the lands west of the Allegheny Mountains to settlers

Explanation:

The act had the purpose to appease the Indian tribes and stop the encroachment of Indian lands by white colonists. It created a border (the so-called proclamation line)  between the colonies of the Atlantic Coast and the Indian lands west of the Appalachian Mountains (of which the Allegheny Mountains make part).

it increased the power of the king of england.

c. free trade can lead to low pay for workers in poorer countries.