Read the following passage and answer the item that follows. Your answer to this item should be based on the passage only. The quest for cheap and plentiful meat has resulted in factory farms where more and more animals are squeezed into smaller lots in cruel and shocking conditions. Such practices have resulted in many of the world's health pandemics such as the avian flu. Worldwide, livestock are increasingly raised in cruel, cramped conditions, where animals spend their short lives under artificial light, pumped full of antibiotics and growth hormones, until the day they are slaughtered. Meat production is water-intensive. 15000 litres of water is needed for every kilogram of meat compared with 3400 litres for rice, 3300 litres for eggs and 255 litres for a kilogram of potatoes. What is the most rational and crucial message given by the passage?

• A. Mass production of meat through industrial farming is cheap and is suitable for providing protein nutrition to poor countries.
• B. Meat-producing industry violates the laws against cruelty to animals.
• C. Mass production of meat through industrial farming is undesirable and should be stopped immediately.
• D. Environmental cost of meat production is unsustainable when it is produced through industrial farming.