Answer:
Option D = Poor countries often cannot afford investments that ensure access to fresh water.
Step-by-step explanation:
This question wants to test out knowledge on biodiversity and how the loss of water affects it. Fresh water is needed for plants to grow. Several activities by man such as the use of chemical and fertilizers been washed into the sea, oil spillage and so on causes the pollution of fresh water.
So, because of the great resources (money) of the wealthy countries they have access to good facilities as these countries make use of their money to make sure they are still having access to fresh water despite the pollution caused by man activities.