Which of the Following Is an Example of the Greatest

Which of the following is an example of the greatest cause of biodiversity loss in the world today?

A) In the United States,the Army Corps of Engineers reroutes major rivers to improve the waterways for commercial navigation.
B) In Brazil,ranchers cut and burn rain forest to clear fields for grazing cattle.
C) In the United States,large fields once used to plant corn and soybeans are being converted for housing developments and commercial properties.
D) In northern Canada,native people continue to hunt seals and harvest fish from arctic seas.