Which of the Following Is True About Vanilla

Which of the following is true about vanilla?

A) Vanilla is originally from an orchid,Vanilla planifolia,indigenous to the New World tropics.
B) Uncured or unfermented vanilla beans lack the characteristic flavor,which is due to vanillin.
C) When properly cured,the pods are black.
D) Synthetic vanilla accounts for 99 percent of all vanilla currently sold on the market.
E) All of the above are correct.