Sentences of a paragraph are given below in jumbled order. Arrange the sentences in the right order to form a meaningful and coherent paragraph.

A. Ivory hunters were responsible for wiping out elephants in majority of the African regions.
B. Elephant ivory has been exported from Africa and Asia for centuries with records going back to the 14th century BC.
C. Elephants ivory trade poses a threat to the very existence of elephants. 
D. At the peak of the ivory trade, pre 20th century, during the colonization of Africa, around 800 to 1,000 tonnes of ivory was sent to Europe alone.