What is the most rational and crucial message given by the passage?

Correct Option: Environmental cost of meat production is unsustainable when it is produced through industrial farming.

The passage focuses on the multi-dimensional negative impacts of mass meat production through industrial factory farming. It highlights severe animal cruelty, the emergence of global health pandemics (like avian flu), and highly unsustainable environmental resource consumption (requiring 15000 litres of water per kilogram of meat compared to crops). Option D is the most rational and crucial message because it directly addresses how the immense resource footprint (particularly water) and ecological pressures make industrial meat production environmentally unsustainable. Option A is opposite to the passage's critical tone. Option B captures only the ethical dimension. Option C is too extreme and prescriptive ("should be stopped immediately"). Therefore, Option D is the most balanced and accurate option.