Final answer:
The American colonists' motivation for declaring independence stemmed from issues like taxation without representation, as exemplified by Great Britain taxing the colonies but not allowing them to participate in politics.
Explanation:
The sentence that describes a factor that motivated American colonists to declare their independence from the British is:
A. Great Britain taxed the colonies but did not allow them to participate in politics.
This statement exemplifies one of the core grievances the colonists had against British rule, which was taxation without representation. The colonists believed that they should have a say in the laws and taxes imposed on them, leading to their desire for independence.
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