Question

how did the stamp act contribute to the boston massacre?
british officials ordered their troops to fire on any colonist who opposed the stamp act, which led to the massacre.
colonists angered by british taxes took out their frustrations on british troops, which eventually led the troops to fire at the colonists.
british troops stationed in boston enforced heavier taxes on colonists than the stamp act allowed, which led to the clash.
colonists boycotted items on which the stamp act was imposed, which was illegal under british law and punishable by death.

Explanation:

The Stamp Act imposed taxes on colonists without their consent, leading to widespread anger. Colonists' frustration boiled over, and when British troops were present (not directly due to Stamp Act - related heavier taxes as in one option, nor was the Stamp Act illegal under British law as claimed in another, and British officials didn't order troops to fire on any colonist who opposed the Stamp Act). The colonists' anger at British taxes (including the Stamp Act) led to confrontations with British troops, which eventually led to the troops firing at the colonists (Boston Massacre).

Answer:

Colonists angered by British taxes took out their frustrations on British troops, which eventually led the troops to fire at the colonists.