Which of these happened after the wild giant panda population in central China was reported to be 1,864 animals?
A.The IUCN moved the giant panda from "endangered" to "vulnerable" on its Red List.
B.The World Wildlife Fund adopted the giant panda as the organization's symbol.
C.The number of giant pandas in the wild in China was said to be 1,596 bears.
D.The population of giant pandas in China dropped to fewer than 1,000 bears.