The artilleryman says the Martians have not yet begun. Is he talking about them (make all correct answers BOLD) Destroying the earth Destroying the people Using humans for food Mating with humans

He talks about putting humans in cages. I'm not exactly sure where he is going with this analogy:

they will begin catching us systematic, picking the best and storing us in cages and things. That’s what they will start doing in a bit. Lord! They haven’t begun on us yet. Don’t you see that?”