Based on the text, the author, Thomas Jefferson, would most likely support scenario A) A group of concerned citizens protest what they believe are unjust immigration policies.
The excerpt emphasizes the right of the people to alter or abolish a government that becomes destructive to their rights, which aligns with citizens exercising their right to protest against policies they view as unjust. The other scenarios (B, C, and D) involve suppression of rights or violent actions, which would not align with Jefferson's ideals of life, liberty, and the pursuit of happiness.