Which reason best explains why this grievance was included in the declaration?

The reason why grievances were included in the declaration of independence is that trade focused on generating income for the Crown only. The colonies thought it wasn´t right that the British imposed taxes on them. In the process of declaring a new independent nation, the Declaration of Independence levies grievances against King George III of England like:

Thomas Jefferson believed that the King had exceeded his constitutional authority. So the colonies had the right to form a new government.

The Declaration of Independence was written by Thomas Jefferson in June of 1776.

a) it is located in central mexico.