Read the following story conclusion: After the dragon was slain, Sir Leofrick returned to a celebration in the village. Never again were the villagers threatened. But they did find that something had crept in while Leofrick was away, a curiosity about the outside world, a desire for adventure, and every so often they would ask him about his time outside the village. "There's a big world out there," he would tell them. "You should go exploring." Based on the story's structure, which of the following would be the most logical introduction to this story? O A. Teams of dragons have been at war as long as anyone can remember.
O B. Sir Leofrick receives a vision of a dragon terrorizing a town in a dream.
O C. The children in the village cannot seem to get along with one another.
O D. In a magical village, nobody can remember anybody going outside the town's walls.

3one of the biggest impacts a building has on earth is the energy it uses. currently, most of the world’s energy comes from burning fossil fuels. these fuels are dirty and when they are burned they pollute the air and water. one way to burn fewer fossil fuels is to reduce the amount of electricity a building has to use. passive solar heating, which uses heat from the sun, reduces the amount of fossil fuel used to heat buildings. passive solar heating requires a south-facing wall made of glass. when sunlight shines through the wall, it is collected and used to warm the building. another way green buildings reduce their electricity use is to install other energy sources. for example, some green buildings use panels that turn energy from the sun into useable electricity. which is the best summary of paragraph 3? a) fossil fuels are dirty and pollute the air and water. most of the world's energy comes from these fuels. b) the biggest problem of buildings is that they use fuel that is dirty for heating. they need to do something to be more energy efficient. c) panels that turn energy from the sun into electricity and passive solar heating can stop the burning of fossil fuels which pollute air and water. d) since fossil fuels are dirty and pollute the air and water, other technologies that pollute less and produce energy have been developed like solar energy and green buildings.