ANSWER:
States is the last and final answer, D. And does also hold the position of "true".
*Short answer look at the answer above, below is going to give a headache!*
EXPLANATORY:
In North America, the most numerous entities are states. There are a total of 50 states in the United States. Each state has its own government, laws, and regulations. It's important to note that North America also includes other countries such as Canada and Mexico, but when considering the most numerous entities within North America itself, states are the correct answer.