Answer:
Correct answer is Colonists were angered that they were not represented in the British government
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Explanation:
First option is not correct as colonists believed in the democracy and in the equal representations of citizens in the British Empire.
Second option is correct as although they participated in the war, helped Britain to win the war, but still had no representative in the British government that would fight for the rights of the colonists.
Third option is not correct as this had no connection with their ideals and problems.
D. Allowing Texas into the Union would upset the balance of slave and free states in Congress. Though it soon became a state since Manifest Destiny was a very popular idea at the time.
The adopted it because they feared that if they were to intervene it would escalate. Also because the non intervention would prevent a war from happening in the European side of the world.
(let me know if you need a more detailed explanation)