Aframe is to a house as a is to a body.

blood

skin

skeleton

muscle

A frame is to a house as a skeleton is to a body.

Explanation:

A frame of house prevents the structure from falling down.  It is constructed with the help of beams of iron which provide support to the house in the same way as the human skeleton does for the human body. The skeleton is basically the internal framework of the body which provides it the support and help it in many other ways. A human body skeleton made with bones it has 206 bones.

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.