It takes much longer to cook things in the hills than in the plains, because

• A. Due to low atmospheric pressure in the hills the boiling point of water is raised, and therefore water takes longer to boil
• B. In the hills the atmospheric pressure is lower than in the plains and therefore water boils at lower temperatures
• C. In the hills the atmospheric temperature is low and therefore a lot of heat is lost to the atmosphere
• D. In the hills the humid atmosphere absorbs a lot of heat, leaving very little for cooking