Which scientifically investigable question is relational?

What are the side effects of taking aspirin every day?
How are the causes of type I diabetes and type II diabetes similar?
How many people in the United States get the flu each year?
What kind of medicine is used to treat brain cancer?

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.

what are the awnser choices? i mean, without choices, it is an incompleat