Which of the following is the most rational message conveyed 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.
• E. Mass production of meat can lead to water and air pollution.