B: asteroids.
In the early days of the Solar System, the gravitational influence of Jupiter caused the formation of the Asteroid Belt: in this region of the Solar System, there was enough material to form planets, but then Jupiter's gravity increased the velocity of this potentially new planets, so instead of accrete they collide into each other, forming the asteroids we can observe today.
The answer is more-developed countries. Countries that are
considered to be more developed than most countries such as Japan, has a human
population with a large percent of post-reproductive individuals.
Post-reproductive individuals refers to the occurrence after the time in life
wherein an individual is capable of asexual reproduction. It is commonly found
in more-developed countries and may most likely decrease in size as time
passes.
An underground cemetery holding sarchouphaguses. Designed by Romans!
I think the answer is D.
Hope this answered your question ;-;