Read the sentence from "Black Hole Beginnings."
Under the force of its own weight, the gigantic ball presses
inward
What question should readers ask to determine the cause
in the sentence?
How much does the ball weigh?
Why does the ball press inward?
What does the weight of the ball do?
How does the ball produce force?

answer is "why does the ball press inward?"

Explanation:

the correct answer is - d. china has a large and growing population.

the fact that china has a large (the biggest) population, and it is still growing, doesn't hinder the agriculture production in the country. in fact, it can for increased production in the agriculture, since there's more labor force, as well the sheer mass of people produces lots of scientists that come up with new inventions as to how to improve this sector. nice example is the inner mongolia region in china, in general dominated by the gobi desert, but few scientist came up with a nice idea as to how to make the region productive by using plants that are very resistant to droughts, so lots of people have been employed, and the region is becoming greener and greener each year, and the production of food in this region is also increasing.