The events that led to the Revolutionary War were triggered by which of the following?

A) The British raised revenue by increasing the tax rate of the colonies.
B) The British had established suspicious alliances with Indian tribes during the French and Indian War.
C) American separatists assassinated King George III.
D) The British attempted to end slavery in the colonies.

The British increased taxes on the colonies without their consent, leading to significant opposition from American colonists. The most famous example of such opposition was the Boston Tea Party, where colonists dumped imported tea into the harbor to protest against British taxation. This ultimately led to the American Revolution. The other options are not historically accurate: B is partially true, but the alliances with the Indian tribes alone were not sufficient to trigger the Revolutionary War; C is entirely false, as there was no assassination of King George III; and D is also false, as the British did not attempt to end slavery in the colonies.