Which sentence provides the best paraphrase of the first paragraph of this passage?

A.
Cryptozoology is the search by amateurs and professionals for cryptids, large animals whose existence is questioned.
B.
Cryptozoology is a science that involves searching for animals whose existence can be documented by video or camera.
C.
Cryptozoology involves the search for imaginary and extinct animals, such as the Loch Ness monster and Bigfoot.
D.
Cryptozoology began with the search for the Loch Ness monster, which is the most well-known cryptid in existence.