Why Was the Svalbard Global Seed Vault, or "Doomsday Vault

Why was the Svalbard Global Seed Vault, or "Doomsday Vault," constructed?

A) To provide a central bank for "seed capital," or money, for green development in the event of catastrophic environmental changes
B) To store seeds in case of catastrophic environmental changes
C) To protect the world's food seeds from nuclear Armageddon or terrorist attacks
D) The real reason is unknown to the public; this adds to the mystery of the facility