Read Paragraph 4 from the article.
In fact, diseases caused by smoke from open fires and stoves claim 4.3 million lives every year. That's more than AIDS, malaria, and tuberculosis combined.
Which idea does this paragraph develop?
People must determine why diseases caused by smoke and open fires claim so many lives each year.
AIDS, malaria, and tuberculosis are three serious concerns in developing countries.
The effects of using cookstoves are much more deadly than people may realize.
Providing clean cookstoves to people in developing countries will reduce the impact of AIDS, malaria, and tuberculosis.