the answer is B) natural gas
Answer: Coercion
Explanation:
It is the way of making a new government by using force.
Groups such as the Visigoths, Vandals, Angles, Saxons, Franks, Ostrogoths were tribes of people that helped bring about the collapse of rome.
(Not related just helpful. can't not is a double negative. "I can't not leave'' means I can leave)
The biggest reason is probably we can even travel to Mars. Mars is only one planet away from us. the distance is to far for fuel and time. we would need to go much faster and a lot less fuel just to get to Mars.