Based on the quotation, the only valid conclusion that can be drawn its C. Only the colonists' elected representatives should have the power to levy taxes.
As it is implied in the statement by the Stamp Act, it was considered that representatives of the colonies should be elected by colonists themselves. And at the time, the King considered it was in his right to raise money from the colonies to finance the French and Indian Wars, but there was no representation of the colonies in Parliament. Thus, it was considered unconstitutional for Britain to levy taxes on the colonies.
