Please help me with this hw review question

7. (8 points) Suppose we are analyzing the market for wind power in the United States. Graphically illustrate the impact each of the following would have on demand or supply. Also show how equilibrium price and equilibrium quantity would change. A. The price of natural gas, a substitute for wind power, falls. B. A marketing campaign launched advocating wind power to consumers. C. New environmental regulations cause many coal-fired power plants to close. Coal-fired power is a substitute for wind power. D. An engineering advance lowers the cost of carbon-fiber plastics that are used to make wind turbines