How does supply and demand inform the choices of consumers and business owners?

In the sale of goods and services, price is determined by the interaction between supply and demand. In a graph, the point where the supply curve and demand curve intersect is called the equilibrium point. This point corresponds to the equilibrium price, the one a business should seek to charge. If suppliers charge a price higher than equilibrium a surplus will result. If they charge less a shortage will result

The answer should be b.