Explain why the overprescription of antibiotics by doctors, or the overuse of everyday soaps containing antibiotics, can be a health risk.

This is antibiotic resistance. It occurs with over use of antibiotics.

When antibiotics are over used, likely targeted bacteria are being   killed constantly even in absence of an infection. However,  few  bacteria may resist the antibiotics effects(selective pressure) , and therefore survived. If these resistant bacteria who were able to survive the selective pressure  reproduce, they pass the resistant trait/ gene into their offspring.

Therefore with continuous exposure to antibiotics, they will  resist the antibiotics effects(selective pressure),and thus reducing the effectiveness  of antibiotic treatments  with subsequent application.

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.