The bar chart below shows the number of endangered species between 2000 and 2002 per animal class.
Which one of the following pieces of information can be inferred from the bar chart above?
A The number of species of insects that were endangered was almost equal to the number of species of fish that were endangered over the three-year period.
B The number of endangered species of mammals remained constant over the three-year period.
C The number of endangered species of reptiles increased over the three-year period while that of amphibians decreased.
D In 2001, there were exactly four times as many endangered species of birds as there were endangered species of reptiles.
E More species of bird became endangered over the three-year period than any other animal class.