Final answer:
A laissez-faire economy is characterized by a lack of regulations. Therefore, the correct option is B.
Step-by-step explanation:
The main characteristic of a laissez-faire economy is a lack of regulations. Laissez-faire economics is based on the belief that economic markets should operate freely without government intervention. In a laissez-faire economy, businesses have the freedom to make their own decisions without government restrictions or regulations. This means that there are no strict rules or laws governing how businesses operate, which allows for more flexibility and competition.