Why were colonists so upset about the Stamp Act taxes?

*
The amount charged by the tax was very high.
The colonists were not involved in passing the tax.
Colonists resented paying for a war that did not involve them.

All of the above reasons contributed to the colonists' anger and resentment towards the Stamp Act taxes.

pick one

If I have to pick one reason, it would be that the colonists resented paying for a war that did not involve them.