Final answer:
When Jefferson says the king has "refused his assent to laws ... necessary for the public good" in the Declaration of Independence, he means that the king did not approve laws that are important for the well-being and benefit of the public.
Step-by-step explanation:
In the Declaration of Independence, when Thomas Jefferson states that the king has "refused his assent to laws necessary for the public good," he is referring to the British monarch's refusal to approve laws that are important for the well-being and benefit of the public.
This means that the king has disregarded the needs and interests of the colonists by not allowing laws that would benefit their welfare and the common good to be passed.
An example of this would be when the king denied the colonists the right to pass laws that were urgent and significant for their immediate needs.