When coal is burned to produce electricity, the electrical energy produced is less than the potential energy of the coal. Which BEST explains this observation?

• A. The amount energy in the coal is not known.
• B. As the coil is heated, the molecules move so fast that they are destroyed.
• C. Some of the potential energy in the coal is converted into forms of energy other than electricity.
• D. Some of the potential energy in the coal requires more intense heat so that can be compared to electricity.