Ima just tell u to use socratic they have all the stuff
The correct answer is the last one, to protect them and their land.
I am pretty sure that three options from the list represented above are suitable for your question. Just checked the list of activies and come across these ones : discus throw, wrestling and boxing. Therefore A,B,C are the correct ones.
Steel plow was invented by john deere himself he wanted to make farming easier it was used to plow or in other words turn the soil over so it would be easier to plant crops.