The correct option is A Ectoderm
The ectoderm is the outermost of the three primitive germ layers of the embryo. From it, the derivatives are the epidermis and epidermic tissues, such as nails, hair and glands of the skin, the nervous system, external sense organs and mucous membrane of the mouth and anus. As, nervous system is derived from ectoderm, the nerve cell, being a part of nervous system is derived form the same.
Thus, the correct answer is option (A), 'Ectoderm'.