I would say B.
A. often, you have to go out of your way to consume the minmum amount that your body needs, you don't need to limit it
B. Protein is best when you make sure you're varying it to get key nutrients and making leaner selections to avoid consuming fats and sugars.
C. Processed is generally never good health-wise
D. If you stick to beans and peas you're avoiding proteins from meats and other veggies & thus missing out on key benefits from them
