Approximately 68 percent of the world's eggs are produced in intensive farming conditions, where many of the same breeds of chickens are kept in confined spaces. These types of chicken farms tend to use one or two breeds of chickens, known to be good egg layers.

Which of the following is a long-term consequence of eliminating the genetic diversity of the chickens in these farming conditions?

A) The cost of producing eggs would remain low, and fewer farmers would be able to profit.
B) Living conditions for the chickens would encourage people to start eating cage-free farmed eggs.
C) Few chickens raised in these conditions would live long enough to be productive.
D) Resistant diseases would develop quickly and spread easily across entire chicken populations.