Read the passage and then choose the best answer (A, B, C or D) to each question below.
Ordinary houses are full of hazardous waste. The most important hazardous waste in the homes is batteries. When you throw them out with your other garbage, they break open at the landfill. The poison inside them moves through rainwater and other liquids to the bottom of the landfill. Then it can pollute the natural water in the ground. We should use rechargeable batteries. Another hazardous waste in homes is motor oil. Don't throw old motor oil on the ground or throw it on the garbage. It poisons the environment. We should recycle motor oil. Paint is another kind of hazardous waste in homes. Some cities have a "Paint Exchange Day". If you bring in open, unused blue paint and want red, they give you red. Sometimes they mix the paints together into strange colors. If you paint walls with them, you help save the environment.

What is the most important dangerous waste in the homes?

• A. 
  motor oil
• B. 
  paint
• C. 
  batteries
• D. 
  garbage