Answer:
D) Each solar system contains billions of galaxies
Think, there are no other galaxies from the sun to Pluto (not a planet but still in our solar system) and the answer said EACH solar system and, a Galaxy contains solar systems not the other way around.
It is C because with the mountains other countries could not attack one another as easliy because it would be mpre effort and loss of men
Um i think people who owned factories and people that started to move away rrom agriculture got more money
