Here's a problem to solve: Cheetahs have come close to extinction due to hunting, drought, and disease. There is now very little genetic variation in cheetah populations. Which of the following is a result of the limited genetic variation in the current cheetah populations compared to earlier cheetah populations with more variation?

Among the 4 following options, which is the correct answer?

- A: Cheetahs in current populations are more resistant to new diseases.
 
- B: The survival rate of young cheetahs is increased in current populations.
 
- C: Cheetahs in current populations are less able to interbreed with other species.
 
- D: The current cheetah populations are less likely to be able to adapt to environmental changes.
 