Objective: Follow a paleo diet

Which of the following solutions is more sound in terms of naive physics reasoning?

Pick from:
a). eat grass-produced meat, fish, and seafood, fresh fruits, and vegetables, eggs, seeds, and nuts, just like paleo-humans did;
b). eat processed meat, fish, and seafood, fresh fruits, and vegetables, eggs, seeds, and nuts, just like paleo-humans did;
a).